Generally, GP doesn't allow deleting a vendor if there are any history transactions for that vendor. In most cases, this is a good thing because who wants stranded history transactions in their database? However, if you have a really compelling reason to delete a vendor and don't want to delete the vendor history, here's how to do it - make the vendor a Temporary vendor.
Cards>Purchasing>Vendor
* click image to enlarge
GP allows you to delete a Temporary vendor even if history records exist for that vendor. The only requirements are -
- The current vendor balance must be zero
- The 1099 amount for the current year must be zero
- There can be no unposted transactions for the vendor
- There can be no open purchase orders for the vendor
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