Is it possible to control invoice line ordering through autoinvoice?

Summary: Is it possible to control invoice line ordering through autoinvoice?

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We have an integration that take SF orders and creates invoices using autoinvoice. In some case, we notice that the discount lines comes above the actual line. We have not been able to figure out how to control this. Any ideas? In the screenshot below, we can see that discount is line 1 and actual line is line 2. It should be reverse. In most cases it works, but in some cases we see that discount is above actual line. Any ideas how to fix?