Troubleshooting Tip: How to resolve 'Invalid Entries' Error when creating a firewall policy in the GUI with a Custom ISDB as the source

The screenshot below shows the error encountered when utilizing a Custom ISDB Entry:

If this issue is experienced, the workaround is to create the firewall policy via the CLI.

config firewall policy

    edit <ID>

        set status enable

        set name "Deny-Custom-ISDB"

        set srcintf "virtual-wan-link"

        set dstintf "Homebase-VLAN"

        set action accept

        set dstaddr "RDP_Work"

        set internet-service-src enable

        set internet-service-src-name "custom-isdb"

        set schedule "always"

        set service "ALL"

    next
end

This issue [1099749] is fixed in v7.4.8 and v7.6.3.