Invoice numbers when importing from CSV

Hi,
l want to create unique invoice numbers, however when l upload data from the CSV file the invoices loose the numbering that mean we have to manually input them. We have a few to go through. ls there an easier way to go about this?

Regards
Miriam

Can you provide an example of one of your invoice numbers? I’ve just done a test CSV import for invoices and the numbers supplied on the CSV came through fine.

Hi Glen,
Can you kindly email me step by step guide of how l can create and upload a CSV file.

Many thanks