Bug 198504 The same name aggregation should be hint in dialog[0001]
Description: The same name aggregation should be hint in dialog[0001] Step: 1.New a datasource, dataset, table and binding the dataset. 2.New a aggregation column binding on table named aggr1. 3.Drop a aggregation item into table and set the named as aggr1. 4.Click OK Actual result: Pop up an error message said that the name is exist. Expected result: It can hint in dialog when input the same name, but pop up an error dialog
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
{
			IMethodInfo method = (IMethodInfo) iterator.next( );
			if ( method.getName( ).equals( function ) )
			{
				Iterator argumentListIter = method.argumentListIterator( );
				IArgumentInfoList arguments = (IArgumentInfoList) argumentListIter.next( );
				for ( Iterator iter = arguments.argumentsIterator( ); iter.hasNext( ); )
				{
					IArgumentInfo argInfo = (IArgumentInfo) iter.next( );
					if ( argInfo.getDisplayName( ).equals( argument ) )
						return argInfo.getName( );
				}
			}
		}
		return null;
	}
	private String getArgumentDisplayNameByName( String function,
			String argument )
	{
		List functions = DEUtil.getMetaDataDictionary( ).getFunctions( );
		for ( Iterator iterator = functions.iterator( ); iterator.hasNext( ); )
		{
			IMethodInfo method = (IMethodInfo) iterator.next( );
			if ( method.getName( ).equals( function ) )
			{
				Iterator argumentListIter = method.argumentListIterator( );
				IArgumentInfoList arguments = (IArgumentInfoList) argumentListIter.next( );
				for ( Iterator iter = arguments.argumentsIterator( ); iter.hasNext( ); )
				{
					IArgumentInfo argInfo = (IArgumentInfo) iter.next( );