PROBLEM

After we upgraded AIS from version 4.5 to version 4.8, our interactions stopped to work.

SOLUTION

Prior to version 4.8 of AIS there was no need to explicitly specify the database name when configuring a DB2 data source in AS400.

From version 4.8 the database name must be specified.

The database name can be found using the command WRKRDBDIRE - Work with Relational Database Directory Entries.

This command will list the databases.
You need to locate the entry with remote location specified as *LOCAL.