consuming services: connect to on-prem from bas (#570)

* consuming services: connect to on-prem from bas

* tip moved to node.js section

* added profiling and tip

---------

Co-authored-by: Rene Jeglinsky <[email protected]>

guides/using-services.md

@@ -664,6 +664,7 @@ If you receive `404` errors, check if the request contains fields that don't exi
 This works when accessing the entity directly. Additional work is required to support [navigation](#handle-navigations-across-local-and-remote-entities) and [expands](#handle-expands-across-local-and-remote-entities) from or to a remote entity.
 
 Instead of exposing the remote service's entity unchanged, you can [model your own projection](#model-projections). For example, you can define a subset of fields and change their names.
+
 ::: tip
 CAP does the magic that maps the incoming query, according to your projections, to the remote service and maps back the result.
 :::
@@ -1208,7 +1209,7 @@ Your local application needs access to an XSUAA and Destination service instance
 
     [Learn more about `cds bind`.](../advanced/hybrid-testing#services-on-cloud-foundry){.learn-more}
 
-#### Run a Node.js Application with a Destination
+#### Run a Node.js Application with a Destination {.impl .node}
 
 Add the destination for the remote service to the `hybrid` profile in the _.cdsrc-private.json_ file:
 
@@ -1239,6 +1240,10 @@ Run your application with the Destination service:
 cds watch --profile hybrid
 ```
 
+::: tip
+If you are developing in the Business Application Studio and want to connect to an on-premise system, you will need to do so via Business Application Studio's built-in proxy, for which you need to add configuration in an `.env` file. See [Connecting to External Systems From the Business Application Studio](https://sap.github.io/cloud-sdk/docs/js/guides/bas) for more details.
+:::
+
 #### Run a Java Application with a Destination {.impl .java}
 
 Add a new profile `hybrid` to your _application.yaml_ file that configures the destination for the remote service.
@@ -1266,6 +1271,10 @@ cds bind --exec -- mvn spring-boot:run \
 
 [Learn more about `cds bind --exec`.](../advanced/hybrid-testing#run-arbitrary-commands-with-service-bindings){.learn-more}
 
+::: tip
+If you are developing in the Business Application Studio and want to connect to an on-premise system, you will need to do so via Business Application Studio's built-in proxy, for which you need to add configuration to your destination environment variable. See [Reach On-Premise Service from the SAP Business Application Studio](https://sap.github.io/cloud-sdk/docs/java/features/connectivity/destination-service#reach-on-premise-service-from-the-sap-business-application-studio) for more details.
+:::
+
 
 ### Connect to an Application Using the Same XSUAA (Forward Authorization Token) {#forward-auth-token}