Regarding CA GEN 8.6 and the COBOL 6 Compatibility Matrix,
the following note is present:
CA GEN 8.6 delivers object code compiled using COBOL V5.1.1.
Language Environment must include Runtime support for this COBOL
version for the GEN object code to APPLY successfully and execute.
CA GEN, release 8.6
It has been confirmed that only the COBOL v6 runtime modules are needed.
CA GEN has been certified with COBOL 6 with no problems reported.
Please also see knowledge article, 30151: