The third parameter for %DIFF is not valid.
20
Cause . . . . . : The third parameter for built-in function %DIFF must be *MSECONDS, *MS, *SECONDS, *S, *MINUTES, *M, *HOURS, *H, *DAYS, *D, *MONTHS, *MN, *YEARS, or *Y. The built-in function is ignored.
Recovery . . . : Correct the third parameter for built-in function %DIFF. Compile again.
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