Hi Alexandra,

I did a bit of googling to find this link https://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/rzal2/rzal2interfaces.htm.

I think that with this API you can program an extension in Integration Studio to wrap the calls you need to perform to the AS400.

If you need a broader use of the data from AS400 you can try to create a link in SQL Server (OutSystems Database) to the AS400. If you can manage to do this then try to create an extension in integration studio to expose these entities (you a have a nice wizard to help in this task - right click the entities folder and select Import Entities from Database...).

Unfortunately I don't have an AS400 environment so that I can test this but I hope this was helpful anyhow. Cheers,
André