Error: Logical connection <database connection> in Lookup <Lookup transformation name> is either an invalid connection or it exists in both Relational and Application type connections.
In a cached Lookup transformation in the Designer, you specified a database connection name that exists as both a Relational and Application database connection in the Workflow Manager. When the Integration Service runs the session, it cannot determine which connection to use.
In the session properties, select the correct database connection name for the Lookup transformation. Or, you can enter “Relational:” before the connection name if it is a Relational connection, or type “Application:” before the connection name if it is an Application connection.