Andrew:
They have 8 child-care sites and the managers review the invoices each month. Once they are approved and/or corrected, the invoices are printed and mailed. Under their previous software they would send a stack of paper to each site; now they send a PDF file and it works well.

This isn't a problem. They can send a PDF file using the standard spec and then use the "Customer specification" when printing the final invoices.