Factor 1 is specified but Factor 2 is not valid or not specified for operation; defaults to blanks.
20
Cause . . . . . : A CASxx operation has a Factor 1 entry (positions 12 - 25) specified but Factor 2 (positions 36 - 49) is blank or not valid.
Recovery . . . : Specify a Factor 2 entry (positions 36 - 49), or omit the Factor 1 entry (positions 12 - 25). Compile again.
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