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Marco Parisi 2Marco Parisi 2 

Visibility issue with portal user

Hi, 
I have implemented a business logic which sets to complete every related tasks when a case is closed.
Though the process works just fine from internal org, it doesn't seem to function at all from community portal so when a portal user (community user profile and "Customer Community Plus Login" Licence) closes a case, the related activities are not set to completed.
Tried both with process builder and with triggers, no error messages or whatsoever, it just fails to function.
Since at 99.99% the problem is not in the code or in the logic of the business process (which is pretty straightforward), I thought that it could be something related to permissions/visibility. Now:

-"Default internal access" in Sessions Settings for "Cases" Object is set to "Public Read/Write/Transfer"
-"Default internal access" in Sessions Settings for "Activity" Object is set to " Controlled by Parent"
- Portal Users (with "community user profile" and "Customer Community Plus Login" Licence) have "Create", "Read", "Edit" permissions

Someone who can shed some light on this or had already encountered same or very similar issues?
Thank you in advance