UK Off-Peak Day return ticket with restriction forcing use of specific trains?

UK Off-Peak Day return ticket with restriction forcing use of specific trains? - April Calendar

I have an Off-Peak Day Return ticket from Hull [HUL] to Leeds [LDS]. When I purchased this ticket through the Northern app, I also reserved seats for both legs.

When I collected the tickets, I was surprised to see that the restriction code TD. The key part of this restriction (as I read it) is "Seat reservations are compulsory." for outward travel, and "Not applicable" for return travel.

Does this mean that I must travel on the reserved train for one or both of the legs (and not on another service)?

Note: I contacted TransPennine Express about this, and they claim this restriction code does not apply to an Off-Peak Day Return, and I am free to use any service. This is one possible answer, preferably with an explanation of to why tickets might have incorrect restriction codes, and some references as to how to tell the restriction can be ignored.

The tickets in question, showing restriction TD






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