Integer or unsigned subfield has a length that is not valid.
20
Cause . . . . . : The length of a subfield defined as integer (I in position 40) or unsigned (U in position 40) is not 2 or 4 bytes.
Recovery . . . : Change the Field-Location entries (positions 26 - 39) such that the length of the subfield is either 2 or 4 bytes. Compile again.
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