Mail to User on Credit Limit Exceeded

Dear Experts,

I am trying to set up Alert Management for a scenario "Whenever the customer credit limit is exceeded at the time of Sales Order creation (VA01) or at the time of Change SO (VA02) certain users should get an e-mail with the details of customer number, SO number, Credit Limit Exceeded Amont and so on...

Can anyone please help me on how to do this...?

Best Regards,

Venkat