The file itself is the deliverable.
A build begins with the question nobody enjoys: who is excluded? Standardisation happens before matching, never the other way round. Lineage survives the handover rather than being stripped at the door.
Re-supply terms
Agreeing in advance what happens if the file turns out to be wrong.
Known-gap register
A written list of what the file does not contain, kept with the file.
Delivery verification
A final pass against the agreed criteria at the point of handover, not at the point of assembly.
Send the requirement in whatever form you have it and we will shape it into criteria.