CODE: SQL error 1222

In the SQL Server Management Studio, to find out details of the active transaction, execute following command

DBCC opentran()
You will get the detail of the active transaction, then from the SPID of the active transaction.

For example, if SPID is 69 then execute the command as

sp_who2 69
sp_lock 69
Now , you can kill that process using the following command