I'm trying to customise the Service Activity entity which appears on the Service Calendar in Dynamics CRM 2013.
When I open a Solution and click Add Existing, I can see the entity in the list, but when I click Ok I receive a generic error message "An error has occurred.."
There is no JS appearing in the browser console, nothing in the System Log, and nothing in the CRM log. I've tried this on two separate CRM instances.
I'm beginning to think the entity falls into the "you cannot customise this prebuilt MS entity" category, but I cannot find any MS documentation to support this view.
Has anyone been able to customise the entity? And is there any other log location I should be checking?