How to apply dynamic Row level Security based on Username and location?

Question

This the table in which I want to implement Row-level security

and I am using this formula

[location] = LOOKUPVALUE([location],[login],USERPRINCIPALNAME()) 

But it was throwing an error 

A table of multiple values was supplied where a single value was expected

How can I resolve 

Answer 1

You change the data model by the following steps:

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