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