Hi There,
My apologies for the slow reply here. Depending on how this has been set up, you might need to locate and change this code in QuickBooks directly. Im assuming youve added a custom field to Quickbooks which then syncs to method with the pre-generated EDI code. This works fine, however due to a limitiation in the QuickBooks SDK, you are only able to Add data to Custom QuickBooks fields, and not modify existing data.
If you were just looking for where the data would be located in Method, you could export the relevant table using our Import/Export Tool.
Let me know if you need any more help or clarifcation.
Regards,
Ben