I did read the sk114395 and sk30197.
from what i understand; these options are doing the same thing :
Automatic ARP Configuration
sk114395 (source NAT) : by modifying the file $CPDIR/tmp/.CPprofile.sh : but Most cases where we use Proxy ARP in our Production is for source NAT
Manual proxy ARP configuration
This is based on the Note on the sk30197 :
If "Automatic ARP configuration" setting is enabled, but "Merge manual proxy ARP configuration" setting is not enabled, then the Security Gateway ignores the Proxy ARP entries in the $FWDIR/conf/local.arp fil"
Still cannot see the difference between these options. Or maybe there are 3 oprions to configure Proxy ARP ?