com.webobjects.eoaccess.EOGeneralAdaptorException: Object value '10348' for column 7 is not an instanceof String

com.webobjects.eoaccess.EOGeneralAdaptorException: Object value '10348'
for column 7 is not an instanceof String

Ignoring the fact that my time is not set, does anyone know what could be
the cause of this error.(full stack trace below) It occurs when I run the
following code. The value '10348' is the manuscriptId.

I have an entity OutManCorr(OutCorrespondence) which is a subclass of
ManCorr(Manuscript Correspondence). Single table mapping is used.
ManCorr has a non class property manuscriptId which is
used in the 'manuscript' relationship to the Manuscript entity.
{
            columnName = "MANUSCRIPT_ID";
            externalType = NUMBER;
            name = manuscriptId;
            valueClassName = NSNumber;
            valueType = i;
        },

We are using EOGenerator to generate a subclass that presents the public
interface and houses all business logic. (hence the
setMethod(ManCorr.Method.Email)  method). I have already checked to make
sure that all the external types in my eomodel match the database schema.
All the value types and value classes are set correctly.

WebObjects 5.2 with Oracle 8i

Thanks,
Lenny Marks

 public TestSendCorr(WOContext context)
{
        super(context);
        EOEditingContext ec = session().defaultEditingContext();

        Manuscript manuscript = (Manuscript)
            EOUtilities.objectMatchingKeyAndValue
            (ec, "Manuscript", "accode", "LX8437");

        CorrCode corrCode = (CorrCode)
            EOUtilities.objectMatchingKeyAndValue
            (ec, "CorrCode", "code", "OK");

        OutManCorr outCorr = (OutManCorr)
            EOUtilities.createAndInsertInstance(ec, "OutManCorr");

        //relationships
        outCorr.setManuscript(manuscript);
        outCorr.setCorrcode(corrCode);

        outCorr.setMethod(ManCorr.Method.EMAIL);
        outCorr.setSentBy(((Session)session()).user());
        outCorr.setSubject("test");

        ec.saveChanges();

    }

#################################


[1970-01-14 01:21:16 EST] <WorkerThread0>
<com.webobjects.appserver._private.WOComponentRequestHandler>: Exception
occurred while handling request:
com.webobjects.foundation.NSForwardException
[com.webobjects.eoaccess.EOGeneralAdaptorException] null
[1970-01-14 01:21:16 EST] <WorkerThread0>
com.webobjects.foundation.NSForwardException for
com.webobjects.eoaccess.EOGeneralAdaptorException: Object value '10348'
for column 7 is not an instanceof String.
	at
com.webobjects.eoaccess.EODatabaseContext._exceptionWithDatabaseContextInformationAdded(EODatabaseContext.java:4656)
	at
com.webobjects.eoaccess.EODatabaseContext.performChanges(EODatabaseContext.java:6319)
	at
com.webobjects.eocontrol.EOObjectStoreCoordinator.saveChangesInEditingContext(EOObjectStoreCoordinator.java:411)
	at
com.webobjects.eocontrol.EOEditingContext.saveChanges(EOEditingContext.java:3130)
	at TestSendCorr.<init>(TestSendCorr.java:40)
	at java.lang.reflect.Constructor.newInstance(Native Method)
	at
com.webobjects.foundation._NSUtilities.instantiateObject(_NSUtilities.java:529)
	at
com.webobjects.appserver._private.WOComponentDefinition._componentInstanceInContext(WOComponentDefinition.java:462)
	at
com.webobjects.appserver._private.WOComponentDefinition.componentInstanceInContext(WOComponentDefinition.java:572)
	at
com.webobjects.appserver.WOApplication.pageWithName(WOApplication.java:1889)
	at
com.webobjects.appserver.WOComponent.pageWithName(WOComponent.java:1205)
	at Main.toTestSendCorr(Main.java:94)
	at java.lang.reflect.Method.invoke(Native Method)
	at
KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:54)
	at
com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1160)
	at
com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1268)
	at
com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1544)
	at
com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:498)
	at
com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212)
	at
com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1605)
	at
com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:46)
	at
com.webobjects.appserver._private.WOHyperlink.invokeAction(WOHyperlink.java:76)
	at
com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
	at
com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
	at
com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:950)
	at
com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1136)
	at
com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1313)
	at
com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:196)
	at
com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:287)
	at
com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:322)
	at
com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:358)
	at
com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:432)
	at
com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1244)
	at
com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:167)
	at
com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:248)
	at java.lang.Thread.run(Thread.java:491)