Weihrauch (ed.), "Vergabe von Energienetzkonzessionen – Wettbewerbliches Vergabeverfahren – Konzessionsvertrag – Rechtsschutz" in collaboration with Forum Vergabe e.V. In preparation: to be published by Bundesanzeigerverlag.
Meyer-Hofmann/Riemenschneider/Weihrauch (Hrsg.); "Public Private Partnership – Gestaltung von Leistungsbeschreibung, Finanzierung, Ausschreibung und Verträgen in der Praxis", Carl-Heymanns-Verlag Cologne, 2nd edition 2007
Weihrauch/Riemenschneider, "Britische Erfahrungen mit PPP am Beispiel von Justizvollzugsanstalten" (British experience with PPP using the example of correctional facilities), Public Private Partnership Yearbook 2005, Joint Yearbook of FINANCE and ConVent, edited by Detlef Knop, pages 115 - 119
Meyer-Hofmann/Riemenschneider/Weihrauch (Hrsg.); "Public Private Partnership – Gestaltung von Leistungsbeschreibung, Finanzierung, Ausschreibung und Verträgen in der Praxis", Carl-Heymanns-Verlag Cologne, 1st edition 2005
Weihrauch/Meyer-Hofmann, "Vergabepraxis", Otto-Schmidt Verlag, Cologne, 2003
Leinemann/Weihrauch, "Die Vergabe öffentlicher Aufträge", Carl Heymanns Verlag, 1st edition 1999
Author of books and editor of specialist publications on public procurement law, building and architects' law, public-private partnership projects.
Co-author and co-publisher of the book "Vergabe öffentlicher Aufträge", Carl Heymanns Verlag, Cologne, 1999, 1st edition
Co-author and co-editor of the book "Vergabepraxis", Verlag Dr. Otto Schmidt, Cologne, 2003
Co-author and co-editor of the book "Public-Private-Partnership", Carl Heymanns Verlag, Cologne, 2005/2008, 1st and 2nd edition
Procurement Law ForumProcurement law & mixed costingAmbiguities and errors in public tendersFramework agreements for public contracts and current case law from the Higher Regional Court of KoblenzPrice increases and extended delivery times for public contracts under public procurement lawThe review of public procurement decisions in Rhineland-PalatinateProcurement law and waste collection chargesNew value limits in public procurement law and simplification of the claim for damages for the unsuccessful tendererProcurement law – calculation and KISS principleIrregularities in public procurement law 2017Termination of an award procedure without an award and protection of the tenderersAward of contract in public procurement law – which criteria apply?Video on damages in public procurement law, in particular lost profitVideo report on a ruling by the Federal Court of Justice (BGH) concerning the invalidity of substituted declarations of intent.
all entries
Procurement law – Quarterly report 01/2013(pdf, 2 MByte, Lawyer Oliver Weihrauch)
Limit to changing the object of procurement
On the scope for discretion in procurement decisions
Applications for contracts from small and medium-sized enterprises (video)
Weihrauch, "Untergeschobene Willenserklärungen sind unbeachtlich", BGH, judgment of May 14, 2014 – VII ZR 334/12, Vergabeblog.de of July 24, 2014, no. 19701
Weihrauch, "On the requirements for awarding a partially terminated project management contract in a negotiated procedure without a prior call for competition," OLG Naumburg, decision of March 14, 2014 - 2 Verg 1/14, Vergabeblog.de of July 6, 2014, No. 19516
Weihrauch, "Restrictions in the letter accompanying the offer lead to exclusion from the offer!", VK Saxony, decision of January 29, 2014 - 1/SVK/041-13, vpr-online 2014, workshop; Vergaberechtsforum.de
Weihrauch, "Strenge Dokumentationspflichten für Verhandlungsverfahren nach VOF", VK Mecklenburg-Vorpommern, decision of 05.09.2013 – 2 VK 12/13, HDI Ing Letter May 2014, p. 12
Weihrauch, "Even in the negotiation procedure according to the VOF, there is no right to negotiate," VK Saxony, decision of December 20, 2013 - 1/SAVK/042-13, HDI Ing Letter May 2014, p. 11
Weihrauch, "So check who binds themselves forever, whether or not what better finds …", OLG Düsseldorf, decision of 17.02.2014 - Verg 2/14, www.vergabeblog.de, 23.04.2014
Weihrauch, "Made mistakes when preparing the tender? In this case, setting aside the tender is not a "remedy"!" OLG Naumburg, decision of February 27, 2014 – 2 Verg 5/13, www.vergabeblog.de, April 13, 2014
Weihrauch, "Notes on the design of one- or two-stage procurement procedures for the selection of private partners for a mixed-economy company and the subsequent award of road concessions", Higher Regional Court of Düsseldorf, decision of 04.02.2013 – Verg 31/12, VergR 2014, 197 and www.vergabeblog.de, 30.03.2014
Weihrauch, "The commitment to a specific product in the informed consent discussion is binding.", OLG Munich, decision of November 25, 2013 - Verg 13/13, VPR 2014, 69 and HDI-ING Letter March 2013, p. 10 f.
Weihrauch, "Contracting authority must correct incorrectly stated tax and duty rates!", VK Nordbayern, decision of October 29, 2013 - 21.VK-3194-42/13, VPR 2014, 14
Weihrauch, "Instead of a change in the subject matter of the procurement after the award: cancellation of the tender!", VK Rhineland-Palatinate, decision of February 6, 2013 - VK 1-35/12, VPR-online, March 8, 2013
Weihrauch, "Stromkonzessionen: Treu und Glauben bestimmen das Vergabeverfahren!", LG Köln, Urteil vom 07.11.2012 - 90 O 59/12, IBR 2013, 1115
Weihrauch, "Price too high? Appropriate prognosis is a prerequisite for exclusion of tenders!", OLG Munich, decision of 07.03.2013 - Verg 36/12, IBR 2013, 430 Weihrauch, "On the erosion of legal protection in public procurement law", VergabeRechtsForum.de, Quarterly Report 1 | 2013, Editorial
Weihrauch, "Premature deletion from the corruption register: When is a bidder "reliable" again?", VG Berlin, decision of August 9, 2013 - 4 L 456.13, VPR 2013, 127 and HDI-ING Letter December 2013, p. 10
Weihrauch, "Inadequate note of receipt: Bidder receives compensation!", OLG Naumburg, judgment of August 1, 2013 - 2 U 151/12, VPR 2013, 124
Weihrauch, "VOF: Sub-criteria and weighting rules must be defined and announced!", Higher Regional Court of Düsseldorf, decision of October 31, 2012 - Verg 1/12, IBR 2013, 106
Weihrauch, "Alternative offers for total performance allowed: Alternative offers for partial services also possible!", Regional Court Lüneburg, decision of August 2, 2012 – VgK 24/2012, IBR 2013, 100
Weihrauch, "Setting the start of the assignment can violate public procurement law!", Higher Regional Court of Düsseldorf, decision of June 19, 2013, Verg 4/13, VPR 2013, 90 and HDI-ING Letter October 2013, p. 9 f.
Weihrauch, "Fail-safe concept: Suitability or Award Criterion?" Higher Regional Court of Düsseldorf, Higher Regional Court of Düsseldorf, decision of June 19, 2013 – Verg 4/13, VPR 2013, 89 and HDI_ING Letter October 2013, p. 10
Weihrauch, "Price too high? An appropriate prognosis is a prerequisite for excluding a bid," OLG Munich, decision of 07/03/2013 – Verg 36/12 -, VPR 2013, 48
Weihrauch, "Eignung; Referenzen; Vergleichbarkeit; Beurteilungsspielraum, Vervollständigung von Nachweisen; Eignungsleihe; Verpflichtungserklärung; Unterkostenangebot; Antragsbefugnis", OLG München, Beschluss vom 12.11.2012 – Verg 23/12 ("Household Waste and Waste Paper"), VergR 2013, 513-514
Weihrauch, "Instead of a change of the subject matter of the procurement after the award: Annulment of the call for tenders!", VK Rhineland-Palatinate, decision of February 6, 2013 - VK 1-35/12, VPR 2013, 11 and HDI INGLetter, May 2013, p. 11 f.
Weihrauch, "Stromkonzessionen: Treu und Glauben bestimmen das Vergabeverfahren!", Cologne District Court, judgment of November 7, 2012 - 90 O 59/12, IBR 2013, 1115
Weihrauch, "Sub-criteria and weighting rules must be defined and announced!", Higher Regional Court of Düsseldorf, decision of October 31, 2012 - Verg 1/12, IBR 2013,106
Frankincense, "Alternative offers for total performance allowed: Alternative offers for partial services also possible!", Regional Court Lüneburg – judgment dated August 2, 2012 – VgK-24/2012, IBR 2013, 100
Weihrauch, "Environmental and Fair Trade Label in the Terms of Reference," ECJ, judgment of May 10, 2012 - Case C-368/10, HDI INGLetter July/August 2012, p. 8 Weihrauch, "Inadmissible mixed calculation – soon to be an exception?", KG, decision of August 14, 2012, Verg 8/12, HDI INGLetter, October 2012, p. 10
Weihrauch, "Offer unclear: No obligation on the part of the client to provide information!", ECJ, judgment of March 29, 2012 – C-599/10, IBR 2012, 279
Weihrauch, "Client must clarify underpriced offer before excluding offer!", ECJ, judgment of March 29, 2012 – C-599/10, IBR 2012, 278
Weihrauch, "Aggregation of Divided Fees," ECJ, judgment of March 15, 2012 - Case C-574/10, HDI INGLetter May 2012, pp. 9 f.
Weihrauch, "Duty to reprimand only in the event of an infringement!", Higher Regional Court of Düsseldorf, decision of June 30, 2011 – Verg 25/11, IBR 2012, 1208
Weihrauch, "Evaluation of offers according to § 20 VOF: Comparative bidder ranking required!", VK Hessen, decision of October 7, 2011 - 69d-VK-34/2011 (not final), IBR article (workshop)
Weihrauch "Legally Certain and Practicable – Awarding Electricity and Gas Concessions", BehördenSpiegel June 2011, p. 42
Weihrauch, "Nachprüfungsentscheidung nur im Hinblick auf Verletzung von Vergaberecht bindend!, KG, Urteil vom 20.05.2011 - 7 U 125/10, IBR-Beitrag (Werkstatt)
Weihrauch, "Affiliated companies: No secret competition without "Chinese walls"!" Higher Regional Court of Düsseldorf, decision of May 11, 2011 - Verg 1/11, IBR 2011, 1226
Weihrauch, "De facto awarding: Invalidity even with several negotiating partners!", Higher Regional Court of Düsseldorf, decision of August 3, 2011 - Verg 33/11, IBR 2011, 717
Weihrauch, "Änderung der Verdingungsunterlagen: Angebot zwingend auszuschlie&szten!, VK Lüneburg, Beschluss vom 14.01.2011 - VgK-63/2010, IBR 2011, 542
Weihrauch, "A reprimand is only necessary when there is knowledge, not when there is mere suspicion!", OLG Frankfurt, decision of October 5, 2010 - 11 Verg 7/10, IBR 2011, 240
Weihrauch, "Abänderndes Zuschlagsschreiben ist neues Angebot: Ohne Annahme kein Vertrag!", KG, judgment dated May 20, 2011 - 7 U 125/10, IBR 2011, 392
Weihrauch, "Multiple offers: Exclusion despite consent of the awarding authority!", Higher Regional Court of Düsseldorf, decision of November 16, 2010 - Verg 50/10, IBR 2011, 230
Weihrauch, "VOF: When are undisclosed award and weighting criteria permissible?", OLG Frankfurt, decision of October 5, 2010 - 11 Verg 7/10, IBR 2011, 163
Weihrauch, "Competition-restricting agreement: Exclusion only with secure knowledge!" OLG Celle, decision of December 2, 2010 - 13 Verg 12/10, IBR 2011, 160
Weihrauch, "Aptitude test despite missing page in reference information?" OLG Karlsruhe, decision of June 16, 2010 - 15 Verg 4/10, IBR 2011, 106
Weihrauch, "Bau-ARGE: Payment plan can prevent enforcement!", OLG Dresden, judgment of March 10, 2010 - 6 U 453/09, IBR 2011, 24
Weihrauch, "Burden of proof between imminent damage and causality", OLG Celle, decision of May 12, 2010 - 13 Verg 3/10, IBR 2010, 1382
Weihrauch, "No Formalistic Evaluation of Offers!", VK Saxony, decision of July 6, 2010 - 1/SVK/013-10, IBR 2010, 1380
Weihrauch, "Withdrawal of the application and reimbursement of the costs of the respondent", Higher Regional Court of Celle, decision of June 29, 2010 - 13 Verg 4/10, IBR 2010, 1379
Weihrauch, "The purpose of confidentiality limits the duty of confidentiality!", Higher Regional Court of Karlsruhe, decision of June 16, 2010 - 15 Verg 4/10, IBR 2010, 1378
Weihrauch, "Bid exclusion due to mixed costing only after clarification of the offer!", VK Nordbayern, decision of November 17, 2009 - 21.VK-3194-50/09, IBR 2010, 1265
Frankincense, "Fax complaint to Gründonnerstag 19:24: When is it considered received?" VK Saxony, decision of 06.07.2010 - 1/SVK/013-10, IBR 2010, 712
Weihrauch, "Proof of suitability: unreasonableness only if there is no objective reason for it!", OLG Koblenz, decision of October 4, 2010 - 1 Verg 8/10, IBR 2010, 707
Weihrauch, "Unterkostenangebot: No exclusion without proper information!", OLG Celle, decision of September 30, 2010 - 13 Verg 10/10, IBR 2010, 649
Weihrauch, "Unterpreisangebot: Inadequacy must be obvious without detailed examination!", OLG Karlsruhe, decision of June 16, 2010 - 15 Verg 4/10, IBR 2010, 588
Weihrauch, "Consultants/Experts in Tender Procedures: Up to What Limit May They Participate?" OLG Karlsruhe, decision of June 16, 2010 - 15 Verg 4/10, IBR 2010, 583
Weihrauch, "VOF: No notice means no 15-day period according to § 107 (3) no. 4 GWB!", OLG Celle, decision of May 12, 2010 - 13 Verg 3/10, IBR 2010, 415
Weihrauch, "Documentation requirements under Section 18 VOF", OLG Celle, decision of May 12, 2010 - 13 Verg 3/10, IBR 2010, 414
Weihrauch, "Allocation of cases must not lead to a loss of quality!", OLG Celle, decision of April 26, 2010 - 13 Verg 4/10, IBR, 2010, 349
Weihrauch, "Landesbetrieb Straßenbau NRW: Kostenfreiheit im Nachprüfungsverfahren!", OLG Düsseldorf, decision of September 14, 2009 - Verg 20/09, IBR 2010, 57
Weihrauch, action brought by a consortium against the guarantor of a shareholder: jurisdiction of the civil chamber!", OLG Cologne, decision of July 20, 2005 - 5 W 80/05, IBR 2008, 1139
Frank, "Wage lawsuits against joint ventures: commercial court has jurisdiction!, district court, decision from February 14, 2008 – 2 AR 3/08, IBR 2008, 487
Weihrauch, "Enforcement block: As a rule, no claim for compensation among co-partners of a BGB company!", OLG Koblenz, judgment of April 25, 2006 - 1 U 1026/04, IBR 2007, 1156
Weihrauch, "Deviation from the requirement of product neutrality can be justified!", VK Schleswig-Holstein, decision of November 28, 2006 - VK-SH 25/06, IBR 2007, 1138
Weihrauch, "Construction by GbR: Obligation to Promote Despite Impaired Performance in the Internal Relationship," OLG Koblenz, judgment of July 12, 2006 - 1 U 1322/05, IBR 2007, 1029
Weihrauch, "Vertragserfüllungsbürgschaft einer ARGE dient nicht der Absicherung der Gesellschafter untereinander!", OLG Köln, Urteil vom 17.01.2007 - 17 U 20/06, IBR 2007, 679
Weihrauch, "Damages for errors in the procurement procedure: local and regional courts have subject-matter jurisdiction!", OLG Celle, decision of June 7, 2007 - 4 AR 24/07, IBR 2007, 458
Weihrauch, "Incomplete Offers – Practical Relevance – Legal Consequences – Open Questions", Documentation of a lecture at the Speyer Procurement Law Day 2006, VergR 2007, 430
Weihrauch, "Deferring effect of the complaint also possible if the tender is canceled!", OLG Munich, decision of May 24, 2006 - Verg 12/06, IBR 2006, 1462
Weihrauch, "Service Concession: Legal Recourse is Opened" Commenting on the decision of the Higher Administrative Court of North Rhine-Westphalia of May 4, 2006 - 15 E 453/06 -, IBR 2006, 1405
Frankincense, "Notes on the decision of the Higher Regional Court of Munich of May 24, 2006 – Verg 10/06 – (mixed costing; interpretation of contract documents; reduced unit prices; unconditional price reduction), VergabeR 2006, 933, 939
Weihrauch, "Vergabe unterhalb der Schwellenwerte: Rechtsschutz vor den Verwaltungsgerichten?" OVG Rheinland-Pfalz, decision of September 14, 2006 - 2 B 11024/06, IBR 2006, 685
Weihrauch, "Awarding below the threshold values: administrative court proceedings initiated!" Commenting on the Higher Administrative Court of North Rhine-Westphalia, decision of August 11, 2006 – 15 E 880/06 -, IBR 2006, 630
Weihrauch, "Deviating information on sales tax necessarily leads to exclusion!" Commenting on the decision of the VK Saxony of 16.09.2005 - 1/SVK/114-05 -, IBR 2006, 584
Weihrauch, "Subthreshold Award: Neither Ban on Award nor Advance Information Requirement," commentary on the decision of the Higher Regional Court of Dresden of April 25, 2006, 20 U 467/06, IBR 2006, 463.
Weihrauch, "Rechtsschutz bei einer Vergabe unterhalb der Schwellenwerte?" (Legal protection in the case of an award below the threshold values?), Comment on the decision of the Higher Administrative Court of North Rhine-Westphalia, decision of September 20, 2005 - 15 E 1188/05; IBR 2006, 36.
Weihrauch, "Equivalence of building materials: an overall view is sufficient" Comment on the judgment of the Higher Regional Court of Naumburg of 15.03.2005 – 9 U 135/04 – IBR 2006, 437
Weihrauch, "Public Private Partnership – A Status Report," printed in Immobilien Manager, June 2006, pp. 42 f.
Weihrauch, "Deferring effect of the complaint also possible when the tender is annulled" Commenting on the decision of the Higher Regional Court of Munich of May 24, 2006, Verg 12/06, IBR 2006, 1462
Weihrauch, "Sicherungszweck einer Partnerausschüttungsbürgschaft III" (Commenting on the judgment of the Cologne District Court of April 12, 2006, IBR 2006, 333)
Weihrauch, "Announcement of required evidence; offer deadline; 1-euro prices; 'in Pos... included'; mandatory exclusion of all offers; right to cancellation; duty to reprimand; right to apply for review"; commentary on the decision of the Higher Regional Court of Saarbrücken of 9 November 2005 – 1 Verg 4/05 – "Fahrgeldmanagement", VergabeR 2006, 223 [232f.
Weihrauch, "Faulty procurement procedure: No damages for mandatory exclusion of offer", note on the judgment of the Higher Regional Court of Düsseldorf of January 25, 2006 – 2 U (Kart) 1/05, IBR 2006, 349
Weihrauch, "No Jurisdiction of the Administrative Courts," note on the Higher Administrative Court of Lower Saxony, decision of January 19, 2006, 225
Weihrauch, "Partnerausschüttungsbürgschaften in connection with the insolvency of Walter Bau AG"; commentary on the judgment of the Cologne Regional Court of January 10, 2006, IBR 2006, 143
Weihrauch "Comparability of offers", Hanseatic Higher Regional Court in Bremen, judgment of March 23, 2005 - 1 U 71/04 B, BauRB, 2005 i.E.
Weihrauch "Note on the decision of the Higher Regional Court of Munich of July 12, 2005 – Verg 8/05 – BauRB, 2005 i.E."
Weihrauch "Public Private Partnership: Besonderheiten im Vergaberecht", Bundes Bau Blatt, September 2005, pp. 42 - 44
Weihrauch "Formalization tendency to exclude incomplete offers confirmed", note on Higher Regional Court Düsseldorf, decision of December 22, 2004 – VII-Verg 81/04, BauRB, September 2005, pp. 282 - 283
Weihrauch/Meyer-Hofmann, "Public procurement law: in-depth knowledge of the legal framework necessary," in: Allgemeine Bauzeitung No. 21 of May 27, 2005, special supplement PPP, page 11
Weihrauch/Riemenschneider; "Public procurement law and public-private partnerships", Facility Manager 2004
Weihrauch; "Schadensersatz; client characteristics; voluntary tender; order identity", commenting on the decision of the Higher Regional Court of Dresden of 9 March 2004 - 20 U 1544/03 -, VergR 2004, 484
Weihrauch, "Nachprüfungsverfahren: Erstattung von Anwaltskosten des öffentlichen Auftraggebers (III)" Comment on the decision of the Higher Regional Court of Dresden of February 7, 2003 - WVerg 0021/02, BauRB, 2004, p. 21.
Weihrauch, "Nachprüfungsverfahren: Erstattung von Anwaltskosten des öffentlichen Auftraggebers (II)" [Review proceedings: Reimbursement of legal fees of the contracting authority (II)], commentary on the decision of the Higher Regional Court of Schleswig-Holstein of July 15, 2003 - 6 Verg 6/03, BauRB, 2004, p. 17.
Weihrauch, "Review proceedings: Reimbursement of legal fees of the public client (I)" Commenting on the decision of the Bavarian Higher Regional Court of September 19, 2003 - Verg 11/03, BauRB, 2004, p. 14.
Weihrauch, "Effective legal protection in procurement proceedings only if the bidder takes responsibility for his own efforts" Commenting on the decision of the Higher Regional Court of Naumburg of January 16, 2003 - 1 Verg 10/02, BauRB, 2003, p. 111.
Weihrauch, "VOF and HOAI". Commenting on the decision of the Higher Regional Court of Stuttgart of November 28, 2002 - 2 Verg 14/02 - , BauRB, 2003, p. 48
Weihrauch, "Aufhebung der Aufhebung", BauRB, 2003, pp. 56-59
Weihrauch, "Offers must be comparable in every respect!" Commenting on the judgment of the Federal Court of Justice of January 7, 2003 - X ZR 50/01 - IBR 2003, 264
Weihrauch, "Can the bid price be interpreted?" Commenting on the decision of the Saxony Public Procurement Tribunal of July 29, 2002 (1/SVK/069-02), IBR 2002, 628
Weihrauch, "When is the partial annulment of a construction tender permissible?" Commenting on the decision of the Saxony Public Procurement Tribunal of July 29, 2002 (1/SVK/069-02), IBR 2002, 633
Weihrauch, "Angebotsspekulation bleibt riskant", comment on the judgment of the Higher Regional Court of Thuringia of February 27, 2001 - 6 U 360/01 -, VergabeR 2002, pages 419, 424 f.
Weihrauch, "Knowledge in the sense of § 107 para. 3 sentence 1 GWB", note on the decision of the Higher Regional Court of Düsseldorf of June 13, 2001 - Verg2/01, VergabeR 2001, pages 415, 417 f.
Weihrauch, "Unzulässige Doppelausschreibung", commentary on the decision of the Higher Regional Court of Düsseldorf of March 5, 2001 - Verg2/01, VergabeR 2001, pages 234, 237 f.
Weihrauch, "Increased awareness of problems in awarding contracts – experiences with the new public procurement law for public contracts," GaLaBau Report No. 27, July 6, 2001, page 10
Weihrauch, "Special features of the offer in a functional service description", neue Landschaft - trade journal for garden, landscape, playground and sports field construction, August 2000, pages 528 - 530
Weihrauch, "Einstweiliger Rechtsschutz bei Vergabeverfahren unterhalb der Schwellenwerte?" (Interim Relief in Tendering Procedures Below the Threshold Values?), commentary on the decision of the Regional Court of Meiningen of July 7, 2000 (HK O 104/00), IBR 2000, 471.
Weihrauch, "Aufhebung des Vergabeverfahrens bei Verstoß gegen das Prinzip der produktneutralen Ausschreibung?" (Annulment of the award procedure for violation of the principle of product-neutral tendering?), Comment on the decision of the public procurement tribunal at the Halle regional council of December 13, 1999 (VK Hal 20/99), IBR 2000, 209
Weihrauch, "No blanket refusal of the right to inspect files in procurement review proceedings," commentary on the judgment of the Jena Higher Regional Court of October 26, 1999 (6 Verg 3/99), IBR 2000, p. 58
Permanent contributor to the journals IBR, VergabeR and BauRB (the journal BauRB, published by Verlag Dr. Otto Schmidt, was discontinued at the end of 2005).
Permanent employee with numerous publications in the journals IBR / ibr-online.de, Vergaberecht and BauRB (until 2005)