C1
Either field 25 or 57a, but not both, may be present (Error code(s): C77).
C2
Either field 33B or field 39C, but not both, must be present (Error code(s): C34).
C3
If field 32D is present, then field 57a must not be present (Error code(s): C78).
C4
If field 71B is present, then field 32a must also be present (Error code(s): C33).
C5
The currency code in the amount fields 33B and 34B must be the same (Error code(s): C02).