Hi Miguel,
There should be no restriction in executing (presumably Java) code that accesses another database. But in contrast to processing into the same database, there are no callbacks provided to do this task. So you have to create an HTTP connection to the other database and do all the processing in your server extension. Using a Tamino API (e.g. Tamino Java API) might help.
I never tried to do such things, so my considerations are only theoretically.
Best regards,
Julius Geppert
Software AG
#webMethods#API-Management#Tamino