Dr France Bučar, a Slovenian lawyer and politician, is considered one of the most prominent figures in the Slovenian region. He was the president of the first democratically elected parliament, one of the authors of the Slovenian constitution and president of the Slovenian Pan-European Movement. 

Even though administrative contracts are not recognised in the Slovene reg- ulatory framework, they have also appeared in this territory: firstly, only in theoretical discussions and later in courts’ case law, which identifies them by relying on legal theory that derives from the French regulation of the admin- istrative contracts. Consequently, numerous contracts can be found in the Slo- vene legal system containing elements of administrative contracts. However, due to the absence of a special public law regulation or insufficient regulation of such contracts, the rules of obligation law are applicable to them. These rules, however, are not adapted to the specifics of such contractual relations, since they do not consider the fact that in administrative contracts a public- law entity does not act only as a contracting party, but above all as a power. Therefore, the author takes the position that the institute of administrative contracts should also be regulated at our normative level.

Key words: contracts of administration, administrative contracts, distinguishing between administrative contracts and other contracts of administration, special publiclaw regime, models of administrative contracts, replacing administrative acts with an administrative contract.

The principle of the prohibition of reformatio in peius, a fundamental proce- dural principle, is applicable in administrative procedure, though not with- out limitations. Administrative procedure is distinct from other types of pro- cedures, as it requires the administrative body to protect public interest. In some instances, safeguarding this interest necessitates amending the decision to the appellant’s disadvantage. From the perspective of theory and case law, the article analyses the principle of prohibition of reformatio in peius within the decision-making of bodies in administrative proceedings, examining the exceptions to this principle and exploring some other related issues. The first section outlines the content of the prohibition of reformatio in peius in general and the regulation of this institute in some comparative law regimes. The sec- ond section focuses on the analysis of the principle of prohibition of reformatio in peius in the Slovenian regulation of administrative procedure.

Key words: reformatio in peius, exceptions to the prohibition of reformatio in peius, modification of the decision to the detriment of the appellant, the principle of the prohibition of reformatio in peius in the decision-making of a first- instance body, a replacement decision.