Reverted: reverts r1763005 (concerns backport of r1762999 done for R15.12, 14.12 and 13.07) (OFBIZ-8339) As Deepak did for trunk and said: "As setting set-if-null to false fix one issue and introduced another one, reverting commit for now will debug it in more detail and will commit proper fix if found."
ofbiz/branches/release13.07/applications/order/script/org/ofbiz/order/order/OrderServices.xml