The ability to change a customer on a recorded tax invoice.
Rather than delete and re-create the whole document, a change of customer function would reduce duplicating work loads and save a lot of time.
For example: Sarah Smith has arranged work to be completed at a property, however upon receiving the tax invoice she has advised the property is in her parents name and the tax invoice needs to be made out to them.
Alternative example: after completing work for Bob the builder, and invoicing Bob's Building, he has advised the work was for his personal property and needs to be addressed to Bob Bloggs.