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Certification issues  
The aim of this section is to provide guidance related to Certification of ERTMS Interoperability Constituents (IC) and Subsystems (SS).
Feedback from ERTMS projects show that ERTMS ICs and SSs contain restrictions and specific conditions of use. The TSI CCS require that such information should be provided during the certification process, therefore the European Union Agency for Railways has developed a template to ensure that the deviations are described in a common and transparent way. The input for the template has to be provided by the NoBo in collaboration with the applicant. The document listed hereafter contains the template and the guide for its use.