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
null );
			}
			if ( DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX.equals( getSelectedControlType( ) ) )
			{
				if ( dirtyProperties.containsKey( CHECKBOX_DO_NOT_ECHO ) )
				{
					inputParameter.setConcealValue( getProperty( CHECKBOX_DO_NOT_ECHO ) );
				}
			}
			else
			{
				inputParameter.setProperty( ScalarParameterHandle.CONCEAL_VALUE_PROP,
						null );
			}
			if ( DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX.equals( newControlType )
					|| DesignChoiceConstants.PARAM_CONTROL_CHECK_BOX.equals( newControlType ) )
			{
				inputParameter.setProperty( ScalarParameterHandle.FIXED_ORDER_PROP,
						null );
			}
			else
			{
				if ( dirtyProperties.containsKey( CHECKBOX_SORT ) )
				{
					inputParameter.setFixedOrder( !getProperty( CHECKBOX_SORT ) );
				}
			}
			
			if ( !isStatic( ) && !StringUtil.isBlank( listLimit.getText( ) ) )
			{