NULL check in Workflow Condition

Hello, this is my first thread because I can't find any result in old discussions. I need to make a check in a workflow condition to test if a filed (workspace) is null. 
I set this: GV_WF__MYFIELD = NULL and the validation doesn't signal anything. 

Is it correct?
Thank you in advance
 

Hi Mirco, 

DocuWare uses VBA Syntax here. You might want to compare with nothing, or use the ISNULL() function. 

https://docs.microsoft.com/en-us/office/vba/language/reference/user-interface-help/isnull-function

Hope this helps.
Greetings from Germany,
Simon H. Hellmann
DocuWare System Consultant

Yes, it works

ISNULL(GV_WF_MYFIELD) 

Thank you!

and for some strange reason GV = NOTHING works too