Sales Invoice Line Already Exists Error

Hickeye

when trying to post a sales invoice the error The Sales Invoice Line Already Exists appears. I am assuming the line referenced is the first line on the list. If I check the line it has a shipment line linked to it.

How do I move past this error ? Working with NAV 2013 R2

Thanks

TallyHo

Use the debugger, I doubt std. NAV will bring up an error like this.
So check the custom code in CU80.

Hickeye

Thanks