[A] In UnMapped tab of tally integration, you will be able to see the list of invoices (Purchase) raised by counter party who is also using TranZact.

[B] In order to move these invoice to pending tab go to "Map Counter-party Products" and map the items from your inventory against the item present in the invoice. 

[C] After mapping all the items scroll down and click on "Save" button.

[D] Now invoices have moved from UnMapped to Pending tab.

Keywords: Unmapped invoice, Tally Invoice