In some cases it is hard to track which payment correspondents with what invoice, specially when you use pro forma invoicing. I would lik to be able to print the corresponding pro forma invoice on paid invoice so my customer can see what invoices are linked to what payments.
Example:
proforma id is 4000 after paying the invoice number is 251 on the invoice there should be a notice what the proforma invoice was.
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Maybe a hook could solve it and be written in the template so when is changed to final invoice the info is still there.