Some EU regulations are formulated in a way that could lead to diverse implementations among Member States. This could threat the essential harmonisation and interconnection of OOP implementations at EU-level.

Though there are a variety of national and European regulations to support this scenario, the absence of sufficient regulations, particularly on national level, could prevent the seamless implementation of the OOP in the education domain.

There are differing proficiency requirements for pharmacists in different Member States. Additionally, some national legislation limited the access to citizen's medical data to particular professional groups. Consequently, pharmacists with different proficiency levels would have different rights for accessing patients' data, threatening the implementation of this scenario.

Different insurance regulations in the Member States could prevent dispense of medicine in foreign countries.

Though existing agreements between Member States could support the EU-wide implementation of the OOP, probable conflict between these bilateral agreements could hinder the OOP implementation on EU level. These agreements should be harmonised or replaced by EU level agreements and regulations.

While there are many EU-wide and some national political commitments with emphasis on the importance of the OOP, the deficiency of sufficient political commitment on national and local levels could threat the seamless implementation of the OOP in this scenario.

Motor vehicle registration problems are one of the main concerns addressed by the Single Digital Market as it is compiled by the EC. Therefore, more national political commitment is needed to boost the OOP implementation in this area.

While there are many EU-wide and some national political commitments with emphasis on the importance of the OOP, the deficiency of sufficient political commitment on national and local levels could threat the seamless implementation of the OOP in this scenario.

A birth certificate is issued in the official language of the host country. It does not prevent the implementation of the scenario; however, it could leads to administrative burden for parents and the new-born when lodging the certificate in their home country.

While there are many EU-wide and some national political commitments that outline the importance of the OOP implementation, the absence of sufficient political commitment at national and local levels could threat the seamless implementation of this scenario.