When you enter two overrides for the same file name at the same call level, the second override replaces the first override. This allows you to replace an override at a single call level, without having to delete the first override (see Deleting overrides). For example:
Override 1 OVRDKTF FILE(QDKTSRC) LABEL(X) CALL PGM(REORDER)
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Assume that program REORDER uses the diskette file QDKTSRC. Override 1 causes the first call to program REORDER to use the source file with a label of X for its processing. Override 2 causes the second call to program REORDER to use the source file with a label of Y for its processing.