The address of the called program must be in Register 15 when you call Enterprise COBOL programs from assembler programs.
If you have assembler programs that call COBOL programs by using BALR or BASSM and the target program address is not in Register 15 (such as BASSM R14,R10), then the programs will ABEND when you move from OS/VS COBOL to Enterprise COBOL.
For more information see Applications with COBOL and assembler.