[A] If system is showing "Conflict Entry" error as shown below while Integrating invoices to tally, that means there is a mismatch between the Unit Of Measurement(UOM) of tally and the Invoice you are integrating for that product/item.
[B] In this case please add the alternate UOM for that product/item in tally same as you have used in Invoice.
[C] After adding the UOM in tally, try again to integrate the invoice in tally.
Keywords - Conflict Entry, tally error, UOM mismatch