The DC026003 error message with a DC COBOL program normally indicates the program has been compiled with unsupported COBOL compile options.
If you check the DC LOG you will also see this error message: COBOL-BAD COMPILER/OPTION/VERB
Most commonly this is due to the TEST, DYNAM or ADV compile option.
To resolve this add the following options in the PARM statement of the COBOL compile: 'NOTEST,NODYNAM,NOADV'
For a full list of COBOL features not supported by IDMS see section Features Not Supported by CA IDMS in https://docops.ca.com