C1
Field 31C may only be present when field 23 specifies an American style option (Error code(s): C79).
C2
Field 53a may only be present if field 34P is present (Error code(s): C20).
C3
The currency code in the fourth subfield (Currency) of field 23 must be the same as the currency code in field 32B (Error code(s): C88).