RE: Error while uploading Sales Order CSV
Internal or External ID specified values may have duplicates, most likely external ID. Note each transactions must have an unique external id. Your best bet would be to use 2 file import option, 1st file should have only the header information for each transaction including distinct external ID. Other file should contain all the line level data and external id from 1st file as transaction reference. Lookup the related suiteanswer.