Hi Joao,
see http://service.sap.com/connectors -> SAP .NET Connector -> .NET Download -> License Note -> FAQ:
You need additional developer licence, so it not covered by ABAB developer licence. Price pls contact your local SAP Office.
You do not need addtional licence for users - but they need SAP application licence.
By the way web services are free - you do not need any additional tools in .NET.
Jiri
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