When using the Invoices and Credits module, I have noticed that both invoices and credits share the same sequential numbers.
So - any invoices that I convert to credits, or any credits that I create, will use the next sequential number available in the module. E.g. If I have 10 invoices in the module and want to raise a credit, that credit note will be number 11.
This can introduce often sizeable gaps in my invoice numbers where credits sit in between and vice versa.
Having spoken to a friendly Sage technician, it seems the workaround is to set the Credit Note start number to be many magnitudes higher than my next available Invoice number.
As an example, if I am on Invoice number 100, I should set the Credit Start number to be 1000.
There is a problem with this - to me anyway! - all will be well until my invoices reach number 999, in which case they will resume after the last credit note number - which could be 1008 or more if numerous credits are posted in between!
Surely this isn't best practice - I would like a system that facilitates sequential tracking of Invoice numbers AND Credit Notes separately.
To go one further, if I use the convenient 'Credit Invoice' button to quickly generate a credit note from an existing invoice, I would like the original invoice number that is being credited to be recorded somewhere ('Ex. Ref' field for example?) in the Credit. This means when we are trawling the Transactions window, we can cross-reference Invoices against Credits.