Bug 163636 "controlType" and "mustMatch" should be matched
If "controlType" is combo-box, "mustMatch" should be false; else "controlType" is list-box, "mustMatch" should be true.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
SelectionChoice choice = (SelectionChoice) iter.next( );
			if ( choice != selectedChoice )
			{
				String value = null;
				if ( COLUMN_VALUE.equals( property ) )
				{
					value = choice.getValue( );
					if ( isEqual( value, newValue ) )
					{
						return true;
					}
				}
				else if ( COLUMN_DISPLAY_TEXT.equals( property ) )
				{
					value = choice.getLabel( );
					if ( value == null )
					{
						value = choice.getValue( );
					}
					if ( value == null )
					{
						value = LABEL_NULL;
					}
					if ( value.equals( newValue ) )
					{
						return true;
					}
				}
			}
		}