Either the copy file does not exist or it is an IFS copy file which is not supported by the program verifier.
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Cause . . . . . : IFS files are not supported by the CODE version of the RPG Program Verifier. If the file is not an IFS file, the file specified in the /COPY or /INCLUDE compiler directive cannot be found, or cannot be opened at this time. The /COPY or /INCLUDE compiler directive is ignored.
Recovery . . . : To verify source using IFS copy files, avoid using the CODE version of the Program Verifier. If the copy file is not an IFS file, ensure that the file specified in the /COPY or /INCLUDE compiler directive exists and is available to the compiler, and ensure that the CCSID of the /COPY or /INCLUDE file is compatible with the CCSID of the primary RPG source file.