ILE COBOL Language Reference
- A data-name must not be subscripted or indexed when it is being used as a
subscript or qualifier.
- An index may be modified only by a PERFORM, SEARCH, or SET
statement.
- When a literal is used in a subscript, it must be a positive or unsigned
integer.
- When a literal is used in relative subscripting and indexing, it must be
an unsigned integer.
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