SAP Function SDOK_PHIO_RESERVE - Reserve physical information object

Parameter	Reference	Type	Length	Default	Optional	Text
CLIENT	SYST-MANDT	C	3	SY-MANDT	X	Client
OBJECT_ID	SDOKOBJECT	u	42			BOR Key for the Object

Exception	Text
NOT_ALLOWED	Object Cannot Be Locked
NOT_AUTHORIZED	No Authorization
NOT_EXISTING	Object Does Not Exist

Functionality
This function module sets the status indicator "reserved" for aphysical document.
The status indicator "reserved" allows a user to mark a document forediting at some future point. Reservation is independent of checkout,that is, a user who has reserved a document and then wants to edit itstill has to explicitly check out the document.
You cannot reserve a document that has already been reserved or checkedout by another user. However, if you try to reserve a document that hasbeen reserved by another user, this does not trigger an exception.
Once a document is reserved, no other users can reserve or check outthat document.