In Nunavut, where they have high latency issues due to being a satellite network for internet, (and I would assume that Newfoundland might have some of these issues), the jurisdictional apps might decide that leaving out the fixed fields is a good way to reduce the size of the messages. So they might come to agreement with their POS vendors that none of them will send nor validate the fixed fields.
So I think the best we can do is the rules that I stated earlier:
Transmitters should send fixed fields for greatest compatibility.
Receivers must not error if a fixed field is not sent.
Receivers must error if a fixed field is sent and is not correct.
Transmitter and Receivers are allowed to agree on a fixed field policy that is different than above, if circumstances warrant.
Jean Duteau
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