Hello,

First we need to map the external to class by using the wizard. Then by using that class name you can use the Obj- methods on that class. i.e. interacting with external table with Obj- methods.

For configuring Class mapping follow below steps:

1. Designer studio>Data Model > Classes and Properties > Data class mapping

2. In landing page, we have button New External Database table class mapping button, then click it then complete the steps to map the table to class.

Please refer below image for more info: