COBOL requirements for copy processing

For copy processing, all sort requirements apply except for the following restrictions:

When you directly invoke DFSORT, you can use either a separately compiled COBOL E15 user exit or a separately compiled COBOL E35 user exit, but not both.
When you invoke DFSORT from a COBOL program, the following limitations apply when FASTSRT is in effect for:
- Input only: You can use a separately compiled E15 user exit, but not a separately compiled E35 user exit.
- Output only: You can use a separately compiled E35 user exit, but not a separately compiled E15 user exit.
- Input and output: You can use either a separately compiled E15 or a separately compiled E35, but not both together.
If separately compiled E15 and E35 user exits are found together, DFSORT copy processing terminates. Message ICE161A is issued.