This article presents considerations regarding interpretational doubts that arise in connection with a regulation protecting construction contractors under the Public Procurement Law. The main issue raised is the relationship between the provisions of Articles 143a–143d of the Public Procurement Law to the provision of Article 647(1) of the Civil Code. The analysis shows that the problem of the relationship between these legal regulations remains unsettled, despite the legislator amending the provision of Article 143c section 8 of the Public Procurement Law. Contrary to the intentions of the legislator, changing that provision does not resolve the problem of the correlation with the Civil Code’s reference to joint and several liability of the investor with the general contractor for payment of remuneration for work performed by a subcontractor, with the provisions protecting 129subcontractors under the Public Procurement Law. In particular, changes made in Article 647(1) of the Civil Code raise doubts as to the legal consequences of the actions required under the Public Procurement Law. This mainly concerns the obligation to submit draft contracts and copies of contracts with subcontractors to the ordering party, which coincides, under Article 647(1) of the Civil Code, with the obligation of the general contractor to specify the subcontractor and the scope of works performed by the subcontractor for approval by the investor.130