I'm having an issue with a Vendor Bill CSV Import. I'm normally quite good with Imports but for reason I can't figure this one out. I'm getting the error 'One of the columns [id, externalid] must be mapped in the VENDORBILL import'... Says the number of errors is 2, but there's only one line (other than the headers) on the file. I checked to make sure no excess lines or columns on file already. The saved import mapping is correct, and is used multiple times a day.