In the legal areas of contractual claims and tax claims, various requirements exist in EU law and in applicable conventions for the recognition and enforceability of foreign titles of execution, judgments and decisions. Besides the requirements that a foreign title of execution should fall under its particular scope of application, territorial scope, scope of claims, and scope in time, there are often additional requirements and limitations that give rise to possibilities and restrictions, and play an important role in determining the enforceability or non-enforceability of claims. Consequently, an early analysis related to these provisions is a crucial step in assessing the possibility of success or risk of failure.