To unlock the SAP system to perform correction(s) during an upgrade.

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Below are steps for quick reference:

To unlock the SAP system, enter the following commands (here <transport_profile> or DEFAULT.TPP is the transport profile of the transport domain to which the system is connected): The system may be either the original SAP system or the shadow system, depending on which one the error occurred.

Unlock

Original SAP system:

cd \<update directory>\abap\exe
tp unlocksys <SAPSID> pf=..\var\DEFAULT.TPP
tp unlock_eu <SAPSID> pf=..\var\DEFAULT.TPP

Shadow system
cd \<update directory>\abap\bin
SAPup unlockshd

Log on to the SAP system or shadow system and correct the error.
To lock the original SAP system or shadow system again, enter the
following commands:

Lock:

Original SAP system
cd \<update directory>\abap\exe
tp lock_eu <SAPSID> pf=..\var\DEFAULT.TPP
tp locksys <SAPSID> pf=..\var\DEFAULT.TPP

Shadow system

cd \<update directory>\abap\bin
SAPup lockshd

JAVA

Use the User Management Engine (UME) to lock/unlock users so that only authorized users are able to
login during the upgrade activity. For more information see: http://help.sap.com/saphelp_nw70/helpdata/en/ee/10df3d0eb8af5ee10000000a114084/content.htm .
Activate the J2EE Emergency super user, SAP*. For more information
see http://help.sap.com/saphelp_nw73/helpdata/en/48/bb6ca4f5fe307be10000000a42189b/frameset.htm and SAP NOTE: 669848.