Credit control at Goods Issue Stage

You can set the credit control during delivery creation which dont allow store people to create DO for it.

You need to go to tcode: OVA8 and follow the below steps.

Choose CG '02' according to your credit control area to proceed.

You must tick on static, reaction 'B' and status is Block in order to control the creation of DO due to credit limit check.

If you want to create credit limit for sales order, kindly follow this link http://rukawaw-tb.blogspot.com/2010/08/credit-control-at-sales-order.html