ECC EHP4 Upgrade중 아래와 같은 에러가 발생. 1. In order to unlock the system, you must execute these commands: /usr/sap//SYS/exe/run/tp pf=/ abap/bin/DEFAULT.TPP unlocksys /usr/sap//SYS/exe/run/tp pf=/ abap/bin/DEFAULT.TPP unlock_eu 2. Now you should be able to logon into the system with a user different from DDIC. 3. Apply the note's changes manually. Please take into account the note's prerequisites' cor..