Hi Stefano,
My recommendation if you have a simple sql statement for sender or receiver system, just use the sql call atom.
The key expansion atom is a relic to support a kind of backwards compatibility for B1iSN8.8.
With the actual framework versions including B1iSN9.0, it still makes sense to use it for nested key expansions actions but not really for simple requests.
Having this said and you still want to use the key expansion atom, please make sure you've created a BIUMETA for the system type combination as defined in the SLD of your receiver ID and your sender ID.
- Is your sender system and your receiver system from type B1 9.0 in the SLD?
You could add some additional BIUMETAs pointing to the same KERequest.JDBC.01.xsl by creating a new "KE Definition Document" (e.g. generic BIUMETA.B1_B1.xml or explicit BIUMETA.B1.9.0_B1.9.0.xml or BIUMETA.B1.8.8_B1.8.8.xml depending on your concrete sender/receiver type combination).
To apply the key expansion in the test environment, you need to select a concrete sender and receiver system or a test message having these information.
Best regards
Bastian