Did you try this post?(How to link the due date of a specific task into a custom field of a portfolio - #17 by Tetsuo_Kawakami)
I suppose this post will help you because it avoids using today().
Did you try this post?(How to link the due date of a specific task into a custom field of a portfolio - #17 by Tetsuo_Kawakami)
I suppose this post will help you because it avoids using today().