1. login via web
  2. go to the sales tab
  3. click invoices 
  4. sort by the proper date 
  5. choose an invoice
  6. use the "edit" button by the providers name to change the provider associated with that product or service
  7. once complete you will be a green box pop up saying that the change it complete
  8. hit the X on the left corner and you are done! 

Important! The invoice can only be changed within 7 days. After the 7 days passes, the invoice will become locked and no further changes can be made.
Also, make sure that you are granted accurate user permissions to edit. 

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