Locking Includes
Before editing an include, you should lock the include. Locking prevents the include from being edited by other users in parallel. The include lock can be released manually. It is released automatically after the configured lock interval has expired. For details about how to configure the include lock interval, see Defining Content Lock Period.
Tip: Upon editing the include, it is automatically locked for you if it has not been locked already by another user.
Basically, there are two ways to lock includes: either directly from the include list, or via the include detail view.
Locking Includes in List View
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Select the management context from the context selection box, then select Content | Includes.
This opens the Include list view.
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Click the
icon in the row of the include(s) you intend to edit.
An error message appears if the include is currently edited by another user.
Note: Click the 
icon to release the include lock when you are done.
icon to release the include lock when you are done.Locking Includes in Detail View
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Select the management context from the context selection box, then select Content | Includes.
This opens the Include list view.
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Click the name of the include you intend to edit.
This opens the Content tab of the detail view.
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Click the icon at the dialog top.
An error message appears if the include is currently edited by another user.
Note: Click the icon to release the include lock when you are done.
icon to release the include lock when you are done.