1. Say you have a transaction code that must be locked down so no one can use it. How can you lock and unlock this...
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a) Use R3trans and tp utilities with tp unlck
b) Use transaction sm01 to find the transaction and lock/unlock it.
c) Run report rslocktrans from se38 and enter the variant value for the desired transaction and the lock/unlock checkbox.
d) Always use the ABAP workbench to lock transactions.
sm01 is a very useful transaction. Not only can you lock transactions from being used at all in the system, but as a general SAP use it can also be used to look up transaction codes, whether for functional information or simply because you forgot which code you need!