Custom Entity appears as read-only in the Unified Interface
I came across an issue where a custom entity appears read-only in the unified interface but is read-write in the
CRM 2013 Update Rollups and Service Packs
On Sep 22nd 2014 Microsoft released Update Rollup 1 for Microsoft Dynamics CRM 2013 Service Pack 1 and back in
Prices can change on fulfilled orders
KEEPING FOR HISTORICAL REFERENCE
UPDATE - Behaviour has changed
I retested the scenario below in CRM 2016 and the behaviour