Yes. The negotiation procedure without prior publication only requires from a contracting authority to contact several potential candidates and to comply with the fundamental principles of non-discrimination, transparency, competition and proportionality when negotiating with candidates. If contacting several potential candidates is not possible, this has to be explicitly motivated by the contracting authority.
This procedure is only allowed if the contract value is less than EUR 135,000 or if one or more other specific regulatory conditions are met, such as a unsuccessful preceding tender procedure, a strict necessity resulting from unforeseeable urgency or a legal or technical monopoly. However, social and other specific services can be awarded on the basis of the negotiation procedure without prior publication if the estimated contract value is less than EUR 750,000.
Procurement contracts with a minimum value below EUR 30,000 are only subject to the general principles of the first section of the Public Procurement Act and can be awarded simply on the basis of an accepted invoice.