Maximum Document value in Credit check

Hi All

This is make to order scenario

1)I have set a limit for maximum document value in automatic credit control area with Checks -Flagged,reaction-A,status is block

when i create a sales order beyond the maximum document value i able to save without any block Please suggest any other settings to be done for this

2)If sales document is blocked for credit it should not plan for MRP ,Please suggest any other settings to be done for this

Regards