Oracle SOA/BPEL - MDS- oracle.mds.exception.MDSException: MDS-00054: The file to be loaded oramds:/soa/configuration/default/workflow-identity-config.xml does not exist.

(SOA 11g) The source of the problem for us was that it was deployed to both the admin server (mistake!) and the soa server (correct) and we were accessing it on the admin server port (7001) rather than the soa server port (8001) which was correct.

ie. For us

http://hostname:7001/integration/SOADemoCommunity/DemoCommunitySeedServlet (failed and gave the error mentioned)
http://hostname:8001/integration/SOADemoCommunity/DemoCommunitySeedServlet (worked)