Hi,
The documentation for liveintregration says the following (look here: https://doc.dynamicweb.com/documentation-9/integration/integration-framework-2/live-integration#sideNavTitle1-1-3):
- Discounts may be handled at either side of the integration
- To have D365 BC/NAV handle the calculations, check the ERP controls discount calculation checkbox in section C of the live integration settings
- To have Dynamicweb handle the calculations leave the checkboxes unchecked
If you take a look at the link above, theres a checkbox with the text "ERP controls discount calculations". I haven't got this checkbox (only the "Text for discount order lines") on a 9.6.6 running Rapido. Did you hide this setting somewhere else?