Hi, Rebecca,
You can pause but cannot leave the entry screens for that Receipt until it is either Posted or Cancelled. As long as the posted Receipt maintains an Active status, it can be edited but as you've found additional items cannot be added to it.
Can they use common Receipt and Invoice #s adding, say, an extra character to the end to associate the receipts with each other?
Many sites use Adagio PurchaseOrders to manage their POs and Receipts/Invoices. POs themselves can be created and edited/added to as necessary (more commonly done up until the time that items on the POs start to be receipted). In PO, you can combine multiple receipts into a single receipt or, again, use similar receipt codes to associate the Receipts. Or, perhaps items on a PO are just received in separate deliveries and use separate receipts and unrelated Receipt codes. The data flow (document flow) from the opening PO thru to the final invoice is maintained.
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Regards,
Softrak Tech Support