We need to integrate with a system that exposes business entities by an OData co

OData should be accessible as a REST based webservice. So you have some URL that point to the objects and return that as XML or JSON. Both can be parsed with Appina OOTB or plugins.

I did that to access lists and data in SharePoint.

Our team hast only 10 days experience with Appian.
How do we configure this? With service-backed records?
If true, how do the rule looks like?

I think that the Appian documentation is a good point to start with. See

forum.appian.com/.../Records_Tutorial

There is an example on who to access external data. I would prefer to use the JSON format as the XML parser in Appian does have trouble with some quite common things like namespaces and external XSDs.

That allows you to show data. Add some processes as related actions to modify it.

There are plugins to do HTTP requests as well as JSON processing. These two help you to parse the data when reading and to build the data structures when writing back.

Thank you.