For ERP synced projects, when you create a line item for a commitment change order (or a commitment potential change order, if using a 2-tier change order setting), and the "Line Item" section of "New Line Item" is selected, Procore creates the following items:
Since both the commitment's schedule of values and the change order's schedule of values are reflected on the subcontractor invoice, this line item appears twice on the subcontractor invoice:
There currently is no functionality in Procore that can hide that $0 line item from the subcontractor invoice. When creating a subcontractor invoice, the $0 line item should be disregarded and only the change order line item should be billed against.