Abstract
This article analyzes the reimbursement action and its development in the contentious administrative jurisdiction, as well as its relationship with the means of control stipulated in Law 1437 of 2011, and determine if the enrichment without valid reason, stands as a legal title of imputation. In this sense, a theoretical study on the unjustified enrichment, its origins, generalities, characteristics and origin will be made in the first place; Subsequently the subject will be treated from the point of view of the contentious administrative jurisdiction, for which the updated jurisprudential line of the Council of State will be presented, to culminate in the topic of the means of adequate control to claim it, and if this is constituted as a title of imputation Finally, the legal problem will be studied from comparative law, for which Chilean and Ecuadorian doctrine and jurisprudence will be examined.