I am still not clear on your requirement. once the credit block is there at sales order level based on the setting in OVAK and once order is blocked you cannot create the delivery until unless you manually remove the credit block using VKM1 / 2 or 3 or if you want to block at delivery the setting OVLS
From WM perspective as long as we have a valid delivery system will create the TO as there is no credit or customer block are getting executing during TO creation