Two file-names in MERGE statement found in a SAME AREA or SAME SORT/SORT-MERGE AREA clause. Ignored.
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Cause . . . . . : No two files in a MERGE statement may be specified in the same SAME AREA or SAME SORT/SORT-MERGE AREA clause. File-names %1 and %2 belong to either the same SAME AREA or SAME SORT/SORT-MERGE AREA clause.
Recovery . . . : Specify only one of the two files in the MERGE statement.