Thank you Eduard.
At this time, we use JDBC connection and INSERT sql command from panda but we look for a more integrated way to do that.

You're sure about that?
I understand these methods should only be used when the list property comes from a %Persistent object, but new instance with %New method is not allowed.

Oh great!
Please InterSystems developers, make these useful methods public and supported ;-)

it's more a send and forget kind of thing but we will add a deferred response from production B to production A.

Thanks Marc.

We think of writing a REST API to send the IDs of the messages to be sent to production B. The production B service will then read the appropriate records in the mapped table.