Customer credit block

Hello,

I have a Sold To customer which is on credit block (KNKK - CRBLB = X). When I am trying to post an Order IDOC for this customer to create sales order ZOR (TVAK-KLIMP=D Automatic credit control) then IDOC is getting in error status because customer is blocked. But if I create sales order type ZOR manually (VA01) for this customer then system allows me to save the order even though customer has credit block. In OVA8 we have maintained a custom routine in T691F-GRPNO. I need to debug this routine with developer but I just wanted to check is there any standard setting which controls how credit block works for manual and automatic order entry.

Thanks