Rebate Settlement Runs: Rebate Credit Memo not created;Accrued amount is zero

Hello Experts,

I have already created a Rebate Agreement and Activate.
Then create a Sales Order document until the Customer Invoice process is completed.

After that, create Schedule but The result shows that "Rebate credit Memo not created; Accrued amount is zero"

Is there any advice for this?

Best Reguards,

Nittaya H.