How to change the Supplier's Email Address if PO's is of Type Limit

Dear Experts,

Your thoughts are invited on below query.

Scenario: ECS.

Requirement: When PO is of type Limit then Supplier's Email Address should be changed to 'ExpertBuyers@xyz.com'. where PO output has to sent.

If PO is not a Limit PO then Supplier's Email ID should remain the same.

'ExpertBuyers@xyz.com' - Are the organization's Operational Buyers Group Email ID from where they wish to track buying records and operations for Limit PO's.

We appreciate if you mention the technical approach in various possible manner with bADI etc.

Thank you.