Can I use a PBR to set a dropdown value to blank?

I'm trying to integrate a business process rule into a process definition that will revert a dropdown value back to blank if certain conditions are met. Can't seem to make it happen no matter what I try. 

I'm attempting this action through BPRs because the dropdown is a required field and I can't use a process definition action to set a required field to blank. I thought perhaps Sugar wouldn't perform the BPR because of the field requirement. However, it still doesn't work after disabling the field requirement. 

Am I trying to do something that's impossible? 

I am running Sugar Enterprise 10.0.2 cloud. 

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