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Hi oosama123
FQDN rules for objects have been introduced with ASA 8.4(2) - this is why your command is not recognised (according to http://www.cisco.com/c/en/us/td/docs/security/asa/asa-command-reference/A-H/cmdref1/f2.html)
For the records - the ASA API Documentation is on the device available once the API package has been installed and enabled. Just point your browser to https://[your-asa-mgmt-ip]/doc
The documentation gives examples and enables as well direct interact...