Default Value in Dictionary Entry using Javascript

[Katelyn1]

Hey everyone!

I am trying to create a dictionary entry with a default value to be assigned as the name of the user that is signed in. I found some other questions in the community with this question so i was able to get the code from there, but it is telling me this is an invalid default value. This is what I have so far: 

javascript: current.u_requested_for = gs.getUserDisplayName();

I have the type for this dictionary entry as Reference and it is referring to sys_user. My column label name is Requested For, so respectively my column name is u_requested_for. Is my code wrong for this? Is this even allowed what I am trying to do? Is there a different way to go about doing this? 

Thanks!

[vkachineni]

Since it is a Reference field

can you try 

javascript:gs.getUserID();

[Katelyn1]

Unfortunately it still says that is an invalid default value.