The Error details in this case are quite self explanatory.
The event sends an email to some users with updated data.
When I click on save, the changes are not saved, though i get the email with updated data. Save Item(SPContext item Context, Boolean upload Mode, String check In Comment) 20559885 Microsoft.
Perhaps a third-party add-in or add-in developed by another person outside the governance circle.
I wondered if it’d be possible to inject logic into existing add-ins after they’d been deployed to the app catalog. For those of you thinking I’m about to go with a code hack and a suggestion that could compromise compiled code, just hang in a moment longer.
Provider-Hosted Add-ins consist of an APP file in the app catalog, which redirects execution to an endpoint on another sever.
The APP file is really just a glorified ZIP file with App and other supporting files contained.
This is the error message SPException: Save Conflict Your changes conflict with those made concurrently by another user.
If you want your changes to be applied, click Back in your Web browser, refresh the page, and resubmit your changes.] Microsoft.
This led me to the App Installed event that Share Point supports for provider-hosted add-ins.