How to lock and unlock the SAP system during an upgrade!

How to lock and unlock the SAP system during an upgrade!

ISSUE:

• You get the message "Upgrade in progress: no login is possible" when trying to logon
•  You are trying to implement a Note in the system during the upgrade and get the message: "Changes in ACM are locked (decision taken by rule A)"

Solution:

1. To unlock the SAP system, enter the following commands. The system may be either the original SAP system or the shadow system, depending on which one the error occurred.
Original SAP system

cd //abap/bin
./SAPup unlocksys

Shadow system
 
cd //abap/bin
SAPup unlockshd

Log on to the SAP system or shadow system and correct the error.

2. To lock the original SAP system or shadow system again, enter the following commands:
Original SAP system
 
cd //abap/bin
./SAPup locksys

Shadow system
 
cd //abap/bin
SAPup lockshd