Bug 146796 Error message pop up if display text contain non-digital char when add next item
Description: In decimal type parameter creation,display type is "list box", Error message pop up if "display text" contain non-digital char when add next item. Steps: 1.Create a new decimal parameter 2.Set display type as "list box" 3.Input one item: value:1, display text:test 4.Input another item: Value:2 Actual result: error message pop up: The display text already exists! Expected result: Input item succussfully.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
ResultSetColumnHandle cachedColumn = (ResultSetColumnHandle) iter.next( );
			if ( DEUtil.getExpression( cachedColumn ).equals( expression ) )
			{
				return cachedColumn.getColumnName( );
			}
		}
		return null;
	}
	private String getInputControlDisplayName( )
	{
		String type = getInputControlType( );
		String displayName = null;
		if ( controlType.findChoice( type ) != null )
		{
			displayName = controlType.findChoice( type ).getDisplayName( );
		}
		else
		{
			if ( PARAM_CONTROL_COMBO.equals( type ) )
			{
				displayName = DISPLAY_NAME_CONTROL_COMBO;
			}
			else if ( PARAM_CONTROL_LIST.equals( type ) )
			{
				displayName = DISPLAY_NAME_CONTROL_LIST;
			}
		}
		return displayName;
	}
}