May be you can use [OVS help |http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/70cee684-ccbb-2c10-3c94-91e806e5f7ac?QuickLink=index&overridelayout=true] or [freely programmed help|http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/50fd6096-a4b6-2d10-bfa8-bbd9001e0d0e?QuickLink=index&overridelayout=true]
f4 help is used to provide the list of possible values you can enter into that field. This list of values is usually derived from the domain of the data dictionary definition the screen field is based on. Alternatively if you do not want this to happen or if the field does not reference a data dictionary field the F4 help functionality can be created manually.
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