Lock Objects 

Lock objects are used to synchronize access to the same data by more than one program.

Also read the following information:

·        General information about the lock mechanism

·        Description of the structure of a lock object.

·        Brief instructions for creating a lock object.

You can call the complete documentation about the ABAP Dictionary in every maintenance screen of a Dictionary object with Help → Application Help.

You can find further information about the lock concept and how lock management works in the documentation The SAP Lock Concept.