Error trying to edit object during BeforeSetObjectPermission event handling

Question

Hello. 
 
 I have a following task: "if there were added a specific usergroups to permissions of object then to clear a field of this object." 
 I created an eventhandler for event BeforeSetObjectPermissions, it is successfully triggering on adding of usergroups, but I am unable to clear the fields of object. Looks like it is not allowed to make changes in objects during BeforeSetObjectPermissions event handling. I am receiving the error "Operation not allowed. Script is being executed for the object "48". (0x80040834)" at the row with CheckOut or SetProperty function. 
 Is there any way to solve this problem? 
 
 Thank you!

Craig Hawker · Answer

I have just had time to test this, and can confirm that this does not seem to be directly possible, at least in a general way, using the events you mention. 
 I tried to change the permissions on an object that was not checked out. In the "BeforeSetObjectPermissions" event handler I could not call "SetProperty" as it complained that the object was not checked out, but I could not call CheckOut as it complains about the script running. 
 What is interesting is that if I check the object out manually (in the desktop client: right-click and check out), then the SetProperty call on its own works fine (no checkout/checkin needed); when the object is checked in, it has the updated property value. Unfortunately, though, this is not how users generally interact with objects, so it's not a good solution. 
 My initial testing seems to indicate that the same occurs with AfterSetObjectPermissions. 
 My conclusion is that this is not going to be possible to write this in a meaningful way using BeforeSetObjectPermissions/AfterSetObjectPermissions events. 
 I think that you may need to do this within a "BeforeCheckInChangesFinalize" event handler (this runs for both new and updated objects). That most definitely CAN update the object properties.

Error trying to edit object during BeforeSetObjectPermission event handling

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