Create ViewLink / Remove ViewLink dinamically

Problems consistently come up in JDeveloper when:
In our Application Module Implementation we dinamically create a ViewLink (using createViewLink) between to existing ViewObjects and using a defined ViewLink. This works OK.
After using the views we do a findViewLink and then call a it's remove method to delete the VL between the two VOs.
We now set a ViewLink between one of the original VOs and some other VO which also exists.
Error: executeQuery throws an null pointer exception when executed over the detail VO.
Has someone been able to create and delete ViewLinks dinamically? Using which methods? any suggestions appreciated.
Thanks
Gonzalo

Here is the exception:
java.lang.NullPointerException
oracle.jbo.server.ViewRowSetIteratorImpl oracle.jbo.server.ViewRowSetImpl.findMasterViewRowSetIteratorImpl(int, oracle.jbo.server.ViewDefImpl)
ViewRowSetImpl.java:920
com.sun.java.util.collections.ArrayList oracle.jbo.server.ViewRowSetImpl.getMasterKeyValues(boolean)
ViewRowSetImpl.java:2950
java.lang.Object[] oracle.jbo.server.ViewRowSetImpl.getParameters(boolean)
ViewRowSetImpl.java:2899
oracle.jbo.server.RowFilter oracle.jbo.server.ViewRowSetImpl.getRowFilter()
ViewRowSetImpl.java:314
void oracle.jbo.server.ViewRowSetImpl.execute(boolean, boolean)
ViewRowSetImpl.java:515
void oracle.jbo.server.ViewRowSetImpl.executeQuery()
ViewRowSetImpl.java:564
void oracle.jbo.server.ViewObjectImpl.executeQuery()
ViewObjectImpl.java:2616
boolean sam.model.services.searching.RevisionSearcherImpl.selectBySerial(java.lang.String)
RevisionSearcherImpl.java:102 <this is our App. Module>

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