GIVING file %1 is an INDEXED file that has multiple keys. Accepted.
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Cause . . . . . : In the SORT or MERGE statement, the GIVING file %1 is of INDEXED organization that has been defined through the SELECT statement to have more than one RECORD KEY. The file definition of the Sort-Merge file (SD) will override all key definitions, except for the primary record key, of the INDEXED file.
Recovery . . . : To SORT or MERGE the GIVING file by its INDEXED key definitions, use matching record definitions and Sort/Merge KEYs.