Budget override notification on Project based AP invoice

Summary:

We are testing Request Override functionality on AP invoice once it is crossing allocated project budget but am getting below error:

"There are no users with funds override authority for this transaction. The budget manager has been notified."

In manage control budget (project based) we have Allow override flag set as YES and also override rule is defined with user assignment.

Do we also need to define any BPM rule or what is missing here?

Could someone help across?

Thanks.

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