[Logger]

\Classes\InventUpd_Reservation\updateReserveMore

    appl.inventUpdateTTSControl().setTTSBeginLock();

    if (movement.mustBeOnhandLocked(false))
        appl.inventUpdateTTSControl().inventItemLocationSelectLocked(movement.itemId());

\Classes\InventUpdateTTSControl\inventItemLocationSelectLocked

/*
Lock on table inventItemLocation is used for serialisation of updating processes - lock is only used,
if required when instantiating class: InventOnHand (when 'lock' -flag is set to 'true')
*/

public inventItemLocation inventItemLocationSelectLocked(ItemId itemId)
{
    InventItemLocation inventItemLocation;
    ;
   ...
}

\Classes\InventUpdateTTSControl\setTTSBeginLock

/*
Begin secondary transaction (used to establish serializing lock in table InventItemLocation)
*/
public void setTTSBeginLock()
{
    InventUpdateTTSMode tmpTTSMode;
    ;
    if (!this.mustUseTTSSystem())
        return;
   ...
}

обращаю внимание на этт кусок кода

    if (!this.mustUseTTSSystem())
        return;