Here is a list of Knowledge Documents related to Enterprise Cobol Version 5:
TEC1680682 - How can I check that my processor are ready to works with Enterprise Cobol?
TEC1738108 - How Enterprise Cobol can impact Endevor Exits?
TEC1608491 - Why migration to Enterprise Cobol requires to convert PDS to PDSE?
TEC1915537 - How to resolve IEW2606S error?
TEC1356332 - Is there a list of IBM fixes for Enterprise Cobol versions 5 and 6?