It took me a while to figure out how to filter AX (Operations) enum fields in the URL for OData service (I was using Get records in Flow). For example, let’s say I wanted to get sales orders with status = open order.
After a few failed attempts, I actually used classes generated by OData Client Code Generator, constructed a LINQ query and ran it.
context.SalesOrderHeaders.Where(h => h.SalesOrderStatus == SalesStatus.Backorder).ToArray();
Then I intercepted the URL in an event handler for SendingRequest2 and finally got the answer. The filter must be set in this way:
SalesOrderStatus eq Microsoft.Dynamics.DataEntities.SalesStatus'Backorder'
No wonder I didn’t guess it.