In case you were looking to include a new tab in a business object that displays related sales orders for a customer, you might have stumbled across the standard screen /BYD_COD/SalesOnDemand/SalesOrder/UI/COD_SALESORDER_EC.EC.uicomponent.
The problem with this screen was that the "RequestFireOnInitialization" flag was set to false - the standard would fire the inport from the customer screen, so didn't need this setting.
I've raised an incident regarding this and with the latest C4C hotfix (1911.03) SAP have set the above mentioned flag to true.
This means you can now use the above screen to display a customer's sales orders in a custom tab of any standard object (e.g. Service Request) instead of having to create your own screen.