how you resolve above said issue. am also getting similar issues. Please help us to resolve the issue.
Go to OIMDomain > MBean Browser > Application Defined MBeans > oracle.iam > server: oim_server1 > Application: oim > XMLConfig > Config > XMLConfig.SOAConfig > SOAConfig > username
In OID, give appropriate permission to this user (eg. weblogic_idm) and make sure that the user is a part of Administrators Group*.
See if that helps.