Since several products control the processing in your environment, you could receive error messages generated by FOCUS, by VSAM, or by your operating system. Start by evaluating the number of any FOCUS error messages.
If the FOCUS error message number is under 1000, check your procedure for standard FOCUS syntax errors. If the number is over 1000, the error is either a data-adapter-related or user-related problem.
If there is NO error message, review your FOCUS MODIFY procedure.
If the error occurs at the beginning of program execution, check allocations and disk access.
If the output data was truncated, first inspect the field lengths in the Master File and make sure that they match the record lengths in the VSAM data source.
Verify that the Master File adheres to specified format rules.
Check all GROUP definitions and confirm that ALIAS=KEY and that all USAGE and ACTUAL fields are in alpha format.
If there is an alternate index, see that a path was allocated for it.
If processing is extremely slow, use the IDCAMS LISTCAT function to determine whether there are too many CA or Cl splits.
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