PA Document is not generated at billing

Hi

I'm testing a sales order with strategy group 20 (standard requirement type KE).

1. Create a sales order (OR)
2. Convert the planned order to a production order
3. Confirm the production order
4. Settlement
5. Outbound delivery LF against the sales order
6. Billing F2

Everything is fine except there is no COPA document posted at billing. I have tried to transferred the amount manually in KE4S but it's saying "this billing is not profit-related". I'm checking KE4R / KE4U etc. but it seems the entries are all fine... not sure where I'm missing something

milk