Why am I getting this yellow warning message...

Question

This is the error message I receive when attempting the "user" function not the a!user function: 
 
 The user function does not have a domain prefix....

Stewart Burchell · Accepted Answer

the user function does have a domain - it's fn! 
 
 If you write it as fn!user() that message will disappear. 
 
 Some context: these are the available domains: 
 
 ...and it's now been deemed best practice to prefix Appian constructs with their respective domain. 
 (just realized fn! doesn't appear in the above list, which seems to me an oversight! - I'll raise this with Appian Engineering)

zdz · Answer

Hi Anne & Mike -- I'd like to provide some additional context. While the fn! domain prefix exists, and can be used for system functions, we do not enforce this as a strict best practice. We only enforce the best practice of using the a! domain for rules (which is why, as you rightly pointed out Mike, autocomplete in the expression editor automatically adds a! ). 
 
 We recently had a bug where if you used BOTH a system function (such as user() or document() ) AND you also had a rule input or variable with the same name (such as r i!user or local!document ), then Appian would flag the system function as missing a domain. I believe that this is what you were seeing Anne. 
 
 We addressed and removed this bug with AN-186789, available in hotfix 21.2.385.0. As such, you should no longer see system functions called with parentheses underlined as requiring a domain.

Why am I getting this yellow warning message...

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