If the message is a cancellation, that is, Function of the Message (field 23G) is CANC, then subsequence A1 (Linkages) must be present at least once in the message, and in one and only one occurrence of A1, field :20C::PREV must be present; consequently, in all other occurrences of A1, field :20C::PREV is not allowed (Error code(s): E08).
 Sequence Aif field :23G: is ... |
Then subsequence A1 is ... |
And field :20C::PREV is ... |
|---|---|---|
| CANC |
Mandatory (minimum one occurrence of A1 must be present) |
Mandatory in one occurrence of subsequence A1, and not allowed in all other occurrences of subsequence A1 |
| NEWM |
Optional |
Not applicable |
