Windchill PDMLink 10.2 M030: Add To Workspace Repair Task fails with error

wt.system.err wcadmin - (wt.epm.util.EPMNonoverridableConflictsRB/10) wt.epm.conflict.EPMNonOverrideableConflictException:
wt.system.err wcadmin - Add to Workspace conflict
wt.system.err wcadmin - Family Tables of top generics: xxxxxx.asm belong to the same Family Table Master and cannot be added to Workspace XXX simultaneously.
wt.system.err wcadmin - at wt.epm.util.EPMNonoverridableConflicts.getException(EPMNonoverridableConflicts.java:154)
wt.system.err wcadmin - at wt.epm.util.EPMNonoverridableConflicts.throwException(EPMNonoverridableConflicts.java:176)
wt.system.err wcadmin - at wt.epm.workspaces.BaselineServiceUtility.validateOnlyOneIterationForEachFTMaster(BaselineServiceUtility.java:448)
wt.system.err wcadmin - at wt.epm.workspaces.BaselineServiceUtility.add(BaselineServiceUtility.java:657)
wt.system.err wcadmin - at wt.epm.workspaces.EPMStandardWorkspaceManager.addToWorkspace(EPMStandardWorkspaceManager.java:609)
wt.system.err wcadmin - at sun.reflect.GeneratedMethodAccessor857.invoke(Unknown Source)
wt.system.err wcadmin - at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
wt.system.err wcadmin - at java.lang.reflect.Method.invoke(Method.java:606)
wt.system.err wcadmin - at wt.services.ServiceFactory$ServerInvocationHandler.invoke(ServiceFactory.java:399)
wt.system.err wcadmin - at com.sun.proxy.$Proxy158.addToWorkspace(Unknown Source)
wt.system.err wcadmin - at wt.epm.AddToWorkspaceRepairTask.addToWorkspace(AddToWorkspaceRepairTask.java:197)
wt.system.err wcadmin - at wt.epm.AddToWorkspaceRepairTask.executeRepairTask(AddToWorkspaceRepairTask.java:63)