Yes I understand the business object aspect of of the issue, but I guess we would have to do a script because we would need some logic on what to put in the line detail of the invoice.

Yes I understand the business object aspect of of the issue, but I guess we would have to do a script because we would need some logic on what to put in the line detail of the invoice.

Indeed.  The AppliedSalesOrderNo is in the invoice detail table, so you should be able to script a lookup to the correct SO header and get what you want from there.

The way Sage described the multi-SO invoice process, each invoice has a "main" SO, with lines for other SO being added, and for what you're asking I expect a script is the most practical option.