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Marc BaizmanMarc Baizman 

ISNULL on Lookup Fields

Has anyone tried to use ISNULL on Lookup fields?  I'm checking to see if nothing has been chosen, and it seems like ISNULL never returns TRUE if I select a Lookup field. 
Marc BaizmanMarc Baizman
I just found this as a workaround, but shouldn't ISNULL do the same thing?

Code:
LEN(User_Lookup_Field__c ) = 0

 
CTU007CTU007
isnull is for date, number, currency type fields, len() is for text type fields.