Hi Ed,
Thanks for explaining the issue in detail. I am getting the point now. Your approach seems to be right to me. You will need extra logic to determine if a record exists in the active table.
One question I would like to ask. Do you really need the extended key of DSO2? How would the solution look like if in DSO2 you only have the key fields Sales Document and Sales Document Item? You add Billing Plan Number and Billing Plan Item as additional data fields. Then you only need one record and update Billing Plan Number and Billing Plan Item is they exist.
Best regards,
Sander