The following is taken from the KG.
OHR-03-0016
To prevent loss of data when two users simultaneously attempt to update the same record in the database, record reservation can be activated. When record reservation is activated for a particular program, only one user at a time can access a record in the table that the program updates. For example, Activate record reservation for the employee master group of programs (see below). User #1 tries to access an employee's record in the Basic Compensation program (P0801CMP) at the same time that another user is updating the employee's salary information in the Basic Compensation program. Since User #2 accessed the employee's record first, User #1 receives an error message that states that User #2 has the employee’s record reserved. User #1 cannot update the employee's record until User #2 saves her changes and closes the program.
ODS-02-0059
Releasing a Reservation
At the Fast Path type P00095 to bring up the Remove Business Object Reservation (P00095) application. This application will be used to cleanup reservations on objects if a users PC goes down. Once the screen is displayed, click Find.
Note: Make sure that the User that is shown is not actively accessing the Order before releasing the reservation.