Based on the Change Management Parameter and Allow override of settings per vendor(Procurement and Sourcing-->Setup-->Procurement and Sourcing Parameters-->General), either one of the scenario is working i.e. 1.When Change Management Parameter and Allow override of settings per vendor is enabled, Intercompany PO/SO will be created but the Purchase Order Workflow button will be greyed out and will not work. 2. When Change Management Parameter and Allow override of settings per vendor is disabled, Intercompany PO/SO will not be created but the Purchase Order Workflow button will be enabled. In nutshell, either one of the functionality is working but both are not working simultaneously. So,it should work simultaneously.