Query Based Taxonomy - Dynamic Creation of a Query Problem

Hi,
I'm trying to create new category nodes in a taxonomy and to assing them queries. I know how to do this, but I encountered a strange behavior. Here is the situation:
I have a string property DocumentType. When manualy creating a query, it looks like:
DocumentType CONTAINS "Some string"
But when I do the same using code I get:
DocumentType IS "Some string"
And as a result of this, the taxanomy is not working properly.
Here is the code:
     indexService =
     (IIndexService) ResourceFactory
     .getInstance()
     .getServiceFactory()
     .getService(
     IServiceTypesConst.INDEX_SERVICE);
     //        This kind of classification index offers functionality working with query based taxonomies
     qbcIndex = (IQBClassificationIndex) indexService.getIndex(indexId);
     //        Get a query folder - a query folder is a representation of a query based taxonomies category
     queryFolder = qbcIndex.getQueryFolder(RID.getRID(folder));
     //        List of IQueryEntry objects for the query folder
     queryEntryList = queryFolder.getQuery(context);
     //        Cast the IQBClassificationIndex into a ISearchIndex object
     searchIndex = (ISearchIndex) qbcIndex;
     queryEntry = searchIndex.getNewQueryEntry();
     queryEntry.setRowType(IQueryEntry.ROW_TYPE_ATTRIBUTE);
     queryEntry.setPropertyName(propertyName);
     queryEntry.setPropertyOperator(IQueryEntry.PROPERTY_OPERATOR_EQUAL);
     queryEntry.setValue(propertyValue);
     queryEntry.setTermAction(IQueryEntry.TERM_ACTION_EXACT);
     queryEntryList.add(queryEntry);
     //        Set the query for the query folder
     queryFolder.setQuery(queryEntryList, context);
     qbcIndex.updateCategoryContents("Document_Types", false, context);
Can somebody tell me what am I doing wrong please. Isn't it because of IQueryEntry.PROPERTY_OPERATOR_EQUAL? Is there any substring operator?
Thanks a lot.

Hi, Robert
In this moment, I have a problem with Query Based Taxonomy, maybe could you help me. I insert the query in to the taxonomy from code, but when i use the method
qbcIndex.updateCategoryContents("/taxonomies/borrame5/Prueba2", false, context);
I got the next exception:
#1.5#0014C210F3D1002A000001200000565B000431CC93AD5979#1180654627543#System.err#sap.com/irj#System.err#dummy01#10241#####SAPEngine_Application_Thread[impl:3]_17##0#0#Error##Plain###     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)#
#1.5#0014C210F3D100310000012B0000565B000431CCC47166AB#1180655445698#System.err#sap.com/irj#System.err#dummy01#10241#####SAPEngine_Application_Thread[impl:3]_18##0#0#Error##Plain###com.sapportals.wcm.service.indexmanagement.IndexNotReadyException: Some documents are not included in this update because indexing has not been finished yet.#
#1.5#0014C210F3D100310000012C0000565B000431CCC4717417#1180655445701#System.err#sap.com/irj#System.err#dummy01#10241#####SAPEngine_Application_Thread[impl:3]_18##0#0#Error##Plain###     at com.sapportals.wcm.service.indexmanagement.retrieval.trex.AbstractTrexIndex.updateCategoryContents(AbstractTrexIndex.java:2493)#
I have doubt what parameters i need to pass to the method updateCategoryContents,
Let me give some information:
taxonomy:
   /taxonomies/borrame5/Prueba2
repository:
   /documents/Portal_KOF/KM/Pruebas1/Pruebas Versionamiento
classification and search index:
   borrame5
   I can't classify automatically, when i insert the query from code. When I manually insert the query from the portal, automatic classification run perfectly.
Thanks
Greetings
JARO.

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