The Factor-2 index for a LOOKUP operation must be a modifiable field.
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Cause . . . . . : When the operation is LOOKUP, the array index in Factor 2 (positions 36 - 49) cannot be
since these fields cannot be modified.
Recovery . . . : Ensure that the field specified as the index for the Factor 2 entry of LOOKUP is a field that can be modified. Compile again.
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