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
|| type.equals( DesignChoiceConstants.PARAM_TYPE_DECIMAL );
		}
		return false;
	}
	private String getInputControlType( )
	{
		String type = null;
		if ( inputParameter.getControlType( ) == null )
		{
			type = DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX;
		}
		else if ( DesignChoiceConstants.PARAM_CONTROL_LIST_BOX.equals( inputParameter.getControlType( ) ) )
		{
			if ( inputParameter.isMustMatch( ) )
			{
				type = PARAM_CONTROL_COMBO;
			}
			else
			{
				type = PARAM_CONTROL_LIST;
			}
		}
		else
		{
			type = inputParameter.getControlType( );
		}
		return type;
	}
	private String getSelectedDataType( )
	{