C1
The amount in field 19 must equal the sum of the amounts in all occurrences of field 32B (Error code(s): C01).
C2
The currency code in the amount field 32B must be the same for all occurrences of this field in the message (Error code(s): C02).
C3
The repetitive sequence must appear at least twice, but not more than ten times (Error code(s): T11, T10).
C4
If field 56a is present in a transaction, then field 57a must also be present (Error code(s): C81).