hi

 i am mahesh u can go in to the tables  and  when your entyty is locked it will give you one sesson id no

go to table then got to entity table and then find tht sessoin id row  delete that row

entity lock will be removed

do not acces the one terminal strip by two user at a time

select SID, SERIAL#, AUDSID, USER#, USERNAME, COMMAND, OWNERID, TADDR, LOCKWAIT, STATUS, SERVER, SCHEMA#, SCHEMANAME, OSUSER, PROCESS, MACHINE, TERMINAL, PROGRAM, TYPE, SQL_HASH_VALUE, PREV_HASH_VALUE, MODULE, MODULE_HASH, ACTION, ACTION_HASH, CLIENT_INFO, FIXED_TABLE_SEQUENCE, ROW_WAIT_OBJ#, ROW_WAIT_FILE#, ROW_WAIT_BLOCK#, ROW_WAIT_ROW#, LOGON_TIME, LAST_CALL_ET, PDML_ENABLED, FAILOVER_TYPE, FAILOVER_METHOD, FAILED_OVER, RESOURCE_CONSUMER_GROUP, PDML_STATUS, PDDL_STATUS, PQ_STATUS, CURRENT_QUEUE_DURATION, CLIENT_IDENTIFIER from v$session;

What I did, I run the above statement and save it to excel and highlight the user_name that has locked the entity then replace 'sid' and 'serial#' with those values and place in the statement below. There may be many records under the username so repeat the task.

ALTER SYSTEM KILL SESSION 'sid,serial#' IMMEDIATE;

Hope this sharing will ebnefit us all.