Peachtree allows the same invoice number to exist in more than one period. When you enter an import key for invoices, ShipGear finds the oldest invoice first. If the one it finds is not in the current period, you are prompted as to whether this is the correct invoice/period. If not, you then specify the period in which you want to search.
If you have duplicate invoice numbers, you can avoid these prompts by specifying the period from which to get the invoice by including it after an @ in the key. For example
Invoice#@n
Where n = the period number
Note: When you view shipments in ShipGear Front Office, the document key shown will always include the ‘@’ followed by the period number.