Credit is not happening at delivery level

Hi Experts

I have one scenario

We have automatic credit mgmt control check and put the warning and blocked checks at order level and delivery level if customer exceeds credit limit

I given credit limit 100 for x customer in fd32..

I created a one sales order with value of 80.with out warning message

and again second sales order created with value of 30 with warning and order blocked from further processing.

If try to create a delivery for sales order ( 80 value) getting warning message and delivery blocked.

But am not getting any credit check while creating the delivery after releasing the order( 30 value) through vkm4 since customer is exceeded credit limit.

Is this standard sap function once we released sales order and it won't chk at delivery level.

Please revert back on this issue

Regards

Venkat