The SAP System is equipped with a special lock mechanism that synchronizes access to data on the database. The purpose of the lock mechanism is to prevent two transactions from changing the same data on the database simultaneously. Implementation Considerations Locks are defined generically as “lock objects” in the Data Dictionary. A lock request is a specific instance of a lock object and locks a certain database object, such as a correction or a table entry. Lock entries are usually set and deleted automatically when user programs access a data object and release it again.

Integration The SAP lock mechanism is closely related to the update mechanism in R/3 [Extern]. A description of handling lock objects is provided in the ABAP Dictionary Documentation under Lock Objects [Extern]. The ABAP documentation explains the key elements of the lock concept with regard to programming ABAP transactions in the section entitled The R/3 Lock Concept

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