SAP Message 63301 - Offer & was created for rental unit &

Diagnosis
Offer &V1& exists, but it does not refer to the rental unit you haveselected. It was originally created for rental unit &V2& in businessentity &V3&, company code &V4&.

Procedure
You can either correct your entry or confirm the entry in case theoffer is also valid for the selected rental unit, for example, becauserental units are similar.