Hi,
In your case you maintain the 10 L Credit limit customers as High Risk Group and 2 L Credit limit customers as Medium risk.
Maintain the respective Head of Sales and CEO as Credit Representatives.
Do the configuration for triggering mail once an order is blocked due to credit limit to the Credit Representatives.
Discuss with your Basis to provide authorization to VKM3 to release high risk credit orders for CEO and Medium risk for Head of Sales.
Regards,
SRK