Business Connectivity Services (BCS) problem with AuthenticationMode and RevertToSelf

This article addresses a common issue when creating a new BCS External Content Type in SharePoint, where an error occurs due to the AuthenticationMode property set to 'RevertToSelf' and the service application not allowing privilege elevation. The author explains the error message and provides a step-by-step solution using PowerShell to enable the RevertToSelfAllowed property on the Business Data Connectivity Service Application. The fix involves retrieving the service app via Get-SPServiceApplication, setting the property to true, and updating it. This technical guide is relevant for IT professionals working with SharePoint and BCS integrations.