Duplicate Line Number in ra interface lines table for lines belonging to a sales order

 Hi,

Duplicate Line Numbers(Line_Number) are present in the ra_interface_lines table for the lines belonging to a particular sales order. The corresponding sales order line numbers have different items in them.

Couple of qs:

1. How is the line_number populated in the ra interface lines table?

2. The auto invoice import is getting errored out with the following error message:

'Invoice lines with the same invoice number have been separated by the grouping process, causing duplicate invoice numbers'.

I have also ensured that all the mandatory attributes (as reqd by the grouping rule) are populated and are consistent across the lines.