Create ach/eft prenote

You will want to generate Prenotes for your Vendors as this is can be used to verify that your file will be accepted to the Bank.

A prenote is a zero dollar test transaction that is used to validate the Bank Account Information for the Vendor.

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You can set the Checkbook EFT to require a Prenote and generate the Prenote to create a 0.00 dollar file to determine if the information is correct.

The article below covers the steps below.

Guidelines to generate EFT files - Dynamics GP | Microsoft Learn