I used to search it on Excel Add-in but I do not have it on my machine anymore.
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I have used this online tool to search for instruments and data types for Datastream.
DSWS API - What is the pricing for this method of accessing the data?
How to get a point in time (vintage) data from a forecast series?
can you pass a list to datastreamDSWS using ds.get_data?
My API access was suspended. When can I get it back?
Where to seek support saying user is suspended