A UFC6 abend can occur if you have a DC-COBOL program executing a static call to another DC-COBOL program under LE/370 runtime, and at least one of the programs is not compiled with an LE compliant compiler.
Note - a static call is done when the following are true:
1. the call is coded as CALL 'SUBPROGM' where SUBPROGM is the name of the program being called and it is hard-linked with the calling program.
2. the cobol compile option NODYNAM was used.
In a CA-IDMS environment, NODYNAM must be used anyway, DYNAM is not supported.