Duplicate Document Number Error

I have an integration set up to run from a file into GP. When I run it, I get the Duplicate Document Number error. My steps are 1.SOP Get Next Number, 2.SOP Transaction Line, 3.SOP User Defined and 4.SOP Transaction Header. I skip the first step at every change in Customer Number. Whenever there is a customer with multiple lines to be pulled in for one document, I get this error on the second, etc. line(s). My Scribe Insight version is 7.9.2.

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