ITrack/Quickbooks/Error 3100 The name "customer or vendor name" of the list element is already in use
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Error #3100 The name "<customer or vendor name>" of the list element is already in use."
Cause
Because of the dumb way that Quickbooks stores customers and vendors(same table, name being the PK) you can not have a both with the same name.
Solution
Change the name of one of them and try the export again.