Change slicer values

Hello all,

I'm trying to change the values of column operatorGroupId and put these changed values into a new column. 

So far I've tried the following: 

test = IF(Incidents[operatorGroupId]=FALSE(), "580d91e7-6252-4b98-a0ca-06e6533f4b21","Audioproductie Rijswijk") - Error that DAX does not support comparing values of type text with values of type true/false

 

Any ideas how this is done otherwise?

 

Part of the reason why I'm doing this is because the table for operatorGroupId (OperatorGroups) doesn't want to active a many to one relationship because another look up table (IncidentTypes) already has a similar relation with the Incidents table. I'm confused as to why it refuses because both IncidentTypes & OperatorGroups are look up tables. The above problem can be solved by this one, but I am happy for either solution.