Hi,
Go to Tcode AO90 check account determaination in Clearing acct. revenue from asset sale G/l account. for that G/L account check
field status group in OBC4 tcode make Asset retirement field optional. then go T code F-92 postinkey 01 and customer number and sale amount, second screen enter posting key 50 enter GL account which is in Clearing acct. revenue from asset sale G/l account select Reterement check box it will display asset related dialog box there enter your asset number and post your entry.
Thanks
Deepa