Administration: How to lock and unlock a client

There are two methods to lock and unlock a client which is locked while performing 
a client copy.

Steps:

Option 1: TCODE: SCC4 and untick the option "Locked due to client copy"

Option 2: TCODE: SE37

1) Login to the any client with "DDIC" or "SAP*" and execute SE37, 

enter "SCCR_UNLOCK_CLIENT" to unlock or "SCCR_LOCK_CLIENT" to lock a client

 Click the "Execute" button / F8

2) Enter the client number to be unlock and click "Execute" button / F8