Quotation order credit block issue

Dear Expert,

I want to maintain credit block in quotation level and sales order. Sales order should be created under reference quotation order. If quotation order blocked

for credit limit then reference sales order should not be create for that quotation order.

I already maintain credit limit configuration for that quotation order but it is not working. Block quotation order  allowing to create sales order.

Thanks

Md. Enayet Hossain