Both operands of Z-SUB must not be unsigned numeric.
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Cause . . . . . : The Factor 2 entry (positions 36 - 49) and the Result-Field entry (positions 50 - 63) for the Z-SUB operation must not both be defined as unsigned numeric. The operation is ignored.
Recovery . . . : Change the Factor 2 entry or the Result-Field entry of the Z-SUB operation; or change the definitions of the variables specified in the Factor 2 or Result-Field entries. Compile again.
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