Data-name %1 not valid as key name in START for file %2. Statement ignored.
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Cause . . . . . : A data-name used as a key within a START statement must:
Be subordinate to one of the record descriptions for the file
Have the same starting position within that description as does the RECORD KEY within its record description
Be no greater in length than the RECORD KEY.
Recovery . . . : Supply a valid key name or omit the KEY phrase.