What are SAP locks?

SAP locks exists until the application data has been changed in the database, that is, in most cases, until the SAP update is completed. This does not impair performance, since the lock is not a database lock.

To complement the SAP LUW concept, in which bundled database changes are made in a single database LUW, the SAP System also contains a lock mechanism, fully independent of database locks, that allows you to set a lock that spans several dialog steps. These locks are known as SAP locks.

The SAP lock concept is based on lock objects. Lock objects allow you to set SAP locks for entire application objects. An application object consists of one or more entries in a database table, or entries from more than one database table that are linked using foreign key relationships. Before you can set an SAP lock in an ABAP program, you must first create a lock object in the ABAP Dictionary. When you create a lock object, the system automatically generates two function modules with the names ENQUEUE_Name and DEQUEUE_Name. The former allow you to lock in the table, the latter releases the lock object

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