Is the business need - the actual courier name, details must be printed in the invoice printout?
If the courier is incorrect in the billing document, then the printout also has incorrect information.
this is the problem, you would want to change the courier of invoice for quickly reprint it with the correct courier
At what stage of the process does your company choose / finalize the courier?
the client communicates to us the courier collects the goods, but the day of the withdrawal tells us that it will be another courier to collect the goods. And the documents are ready and printed ...
we have the strange customers ... I know 
grazie TW
thanks for your cooperation