I'd like to know how to register new customer order headers and line items in the same migration job.

I have tried this and confirmed that adding CUSTOMER_ORDER and CUSTOMER_ORDER_LINE to the "Method List" tab allows me to update them all at once.

However, when I try to insert both the header and line items, I get the error "DEVELOPER_ERROR_03: Most likely a usage definition is wrongly defined for LU: [CustomerOrder] in table RM_ACC_USAGE_TAB, internal exception: [Ex_Get_Id]."