entry not found in datasource when append srcaddr in firewall local-in-policy

[GCLWLAW]

Hello,

I'm following this guide : 

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-permanently-block-SSL-VPN-failed-lo...

Trying to do an automation to create a new group each day.

I 'm on a FG100E with OS 7.0.17

I manage to create the group with the date :

edit VPN_Failed_Login_%%date%%

But when I want to add this new group to my config firewall local-in-policy with 

append srcaddr VPN_Failed_Login_%%date%%

I got this :

entry not found in datasource

value parse error before 'VPN_Failed_Login_%%date%%'

Command fail. Return code -3

Any help?

Thanks,