SORT/MERGE key %1 is an item of class date-time, but was not a system supported type.
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Cause . . . . . : If the SORT/MERGE key is a non system type, the COLLATING SEQUENCE phrase, and the PROGRAM COLLATING SEQUENCE clause are ignored for the SORT/MERGE. Sorting is done based on the hex-value of the bytes.
Recovery . . . : To use the COLLATING SEQUENCE for the SORT/MERGE, change the SORT/MERGE key to an alphanumeric data item.