IDEMPIERE-169 Query on detail tab is wrongly preserved when changin master record

http://jira.idempiere.com/browse/IDEMPIERE-169

org.adempiere.base/src/org/compiere/model/GridTab.java

@@ -667,6 +667,8 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 				//	Same link value?
 				if (refresh)
 					refresh = m_linkValue.equals(value);
+				if (! m_linkValue.equals(value))
+					setQuery(null);
 				m_linkValue = value;
 				//	Check validity
 				if (value.length() == 0)