We generate proforma invoices for customers whom we would like to pay for goods prior to despatching them.  The issue we appear to have is that when we then despatch the goods, we are generating another invoice.  We would like to simply convert the proforma invoice to a sales invoice, instead of generating a second invoice.   Are we able to despatch goods, updating stock and generating a GDN, without generating the additional invoice, or do we just need to delete the additional invoice as soon as it is generated.

Many thanks in advance.