In this particular client location we agreed on the following
- Printing of duplicate invoice, one for the customer and one for the shop/control
- At end of day we count the number of invoices on hand against the number of invoices submitted on ERPNext.
- We also sum up total value on the physical invoices versus total value on ERPNext.
It is a lot of work, but it needed to be done
I will keep you updated as we extend this to another client location.
Regards