COBCH1775 The alphabet-name clause referenced by the CODE-SET clause must not specify the literal phrase

When the alphabet-name clause is used in the CODE-SET clause of the File Control description, it cannot be set to a literal value; you must change the value or remove the CODE-SET clause from the File Control description.

Configuration section.
Special-Names.
ALPHABET my-alpha is 66 67 68    *> you must correct the value
...
FD out-fil CODE-SET is my-alpha  *> or remove from FD
...