Tip: Before you merge, review invoices for both the old and new supplier to find and resolve duplicate invoices. The merge process doesn't transfer invoices if the merge results in a duplicate invoice for the new supplier.  All invoices : This option also transfers invoices, all or partially paid, and paid prepayments. As an alternative, you can complete the payments and apply prepayments before merging.
When you perform the Merge Suppliers task, you have the option of transferring all invoices or only unpaid invoices.
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When I merging another supplier, why happen take your invoice?