Field help (OBYRNWCON) 

This check box is only used when the Concessions management was defined at the context level as being based on the Renewal mode.
When selected, it indicates that the asset is the subject of a contractual renewal obligation. In that case, it could also be the object of an effective renewal obligation.
It is only accessible in creation. If the setup of field associations allows it, its value can be determined via the implementation of the associations after entering the group or the accounting code.
After the creation validation, the value can only be modified via the Change the concession attributes action.