Data-name-1 must refer to a non-Boolean data item whose implicit or explicit usage is DISPLAY. Data-name-1 can be qualified or subscripted.
Each character of a data item referenced by data-name-1 is assigned an ordinal number incrementing by one from the leftmost position to the rightmost position. The leftmost position is assigned the ordinal number of one. If the data description entry for data-name-1 contains a SIGN IS SEPARATE clause, the sign position is assigned an ordinal number within that data item.
If the data item referenced by data-name-1 is described as numeric, numeric-edited, or alphanumeric-edited, it is operated upon for purposes of reference modification as if it were redefined as an alphanumeric data item of the same size as the data item referenced by data-name-1.
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