How to use a foreign property in a MAC policy?

Question

Hi all, 
 I've tried to convert a foreign property to a string on a Document Item Type as foreign properties aren't compatible with MAC policies, but I'm not getting very far. 
 The current thinking is: 
 
 Create foreign property "input" 
 Create string property "output" 
 Write server event OnBeforeAdd to get value of "input", and set value of "output" to the "input" value as a string
 
 something along these lines: Me.setProperty("output",Me.getProperty("input") As String)

Doesn't seem to be returning anything as the "output" property remains blank. 
 FYI, the foreign property in this instance is a property of created_by_id. Is it something to do with when the creation is actually being registered? 
 Your help's much appreciated! 
 Thanks, 
 RB

alaxala · Accepted Answer

Something like this 
 Dim Inn As Innovator = Me.getInnovator()
Me.SetProperty("output", Inn.GetItemById("User", Inn.GetUserID()).GetProperty("source_property_name_for_input")) 
 And since the created_by_id property never changes once item created you no longer need foreign "input" at all.

How to use a foreign property in a MAC policy?

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