My Jira Automation isn't correctly calculating the field I want it ot

[Gui Annunciacao]

I've introduced a new field in me project called "Weeks Duration." It is supposed to take a targeted end date and dubstract a targeted start date, and represent that value in weeks. 

So if I an issue's targeted end date is on Dec 15, and the targeted start date is on dec 1, then I want the duration to be Dec 15 minus dec 1. 

Here is the syntax I'm using.

{{issue.targetEnd.diff(issue.targetStart).weeks}}

The rule runs every time, but the value is never updated. Just shows nothing. Help?!

[Alexey Matveev]

Hello,

You need:

1. Add the Security Level field to the create, edit and view screens

2. Grant the Set Issue Security permission to the user