Issue with View object query

Hi,
I have extended my controller to add an additional condition to the view object query where I appen an add condition.If there is any kind of exception the add condition keeps on appending without refreshing the query to the orginal one.I have to clear the cache to be able to fix it
below is the peice of code.What should I do to be able to get the original query or refresh it because when i do a getQuery it keeps giving me the query with the earlier condition that I appended and again appends the new condition.
strQuery = oaviewobjectimpl.getQuery();
oaviewobjectimpl.setQuery(strQuery+" AND MtlCategoriesKfv.CONCATENATED_SEGMENTS = '"+strCategory+"'");
RequisitionAMImpl requisitionamimpl1 = (RequisitionAMImpl)oapagecontext.getApplicationModule(oawebbean);
OAViewObjectImpl oaviewobjectimpl = requisitionamimpl.getReqCategoryVO();
String strQuery = oaviewobjectimpl.getQuery();
oaviewobjectimpl.setQuery(strQuery+" AND MtlCategoriesKfv.CONCATENATED_SEGMENTS = '"+strCategory+"'");
oaviewobjectimpl.setWhereClauseParams(null);
oaviewobjectimpl.setWhereClauseParam(0, oapagecontext.getCurrentLanguage());
if(oapagecontext.isLoggingEnabled(1))
oapagecontext.writeDiagnostics(this, "oaviewobjectimpl.getQuery() "+oaviewobjectimpl.getQuery(), 1);
oaviewobjectimpl.executeQuery();
oaviewobjectimpl.last();
if(oapagecontext.isLoggingEnabled(1))
oapagecontext.writeDiagnostics(this, "oaviewobjectimpl.getFetchedRowCount() "+oaviewobjectimpl.getFetchedRowCount(), 1);
ReqCategoryVORowImpl reqcategoryvorowimpl= (ReqCategoryVORowImpl)oaviewobjectimpl.first();
Number categoryId = reqcategoryvorowimpl.getCategoryId();

user610276 ,
Y don't u make a custom VO, as you are doing set query, i expect ur changing entire query of seeded VO, better to use custom VO here and attach it to required beans progrmatically.
--Mukul

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