how to fix this error

Nested exception is: wt.pom.DatastoreException: A SQL error has occurred. Database system message follows:
Nested exception is: wt.util.WTInvalidParameterException: No EnumeratedType exists with "XXX" as its internal value.
at wt.fc.EnumeratedTypeUtil.toEnumeratedType(EnumeratedTypeUtil.java:311)
at wt.fc.EnumeratedType.toEnumeratedType(EnumeratedType.java:431)
at wt.part._QuantityUnit.toQuantityUnit(_QuantityUnit.java:29)
at wt.part._WTPartMaster.readExternal(_WTPartMaster.java:725)