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Field update

I have two object A and B.


When the ID of object B is saved to a field in Object A, a second field in Object A should populate that will now have the name of Object B.


There is no relationship between object A and B. 


Other than trigger what other way is there to do this?




The only way to do this in a formula would be if Object A had a lookup field to Object B.


Since this lookup does not exist then you have to use a trigger OR the process that saves the ID into Object A needs to also save the Name.