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Explanation: Modifications to entries made through Bills-New, Bills-Apply, or Bill-Pay can be done in Vendor History (or General Ledger Transactions).

Locate proper vendor.

In the ’Source’ column, locate and click the Bills-New entry you would like to remove.   This will load a separate tab for Bill Adjust.  Add to Reference area “duplicate entry’ for future reference.  Zero the amount and click Process.  If you have also double applied this invoice; If this relates to an order, you can Select or unselect a Product Line by removing the check mark next to the expander icon. 
 
If you also have two Bills-Pay entries for this invoice, and the check wasn’t sent, click Bills-Pay on the duplicate entry.  This will load a separate tab for Bill Pay - Adjust.  Click VOID to remove this check.

Note: If the check was sent to the vendor, then the Bill-New, and Bill-Adjust should not be adjusted to zero.  When the vendor issues you a credit or a refund, the general ledger would be corrected then.