SAP Message WM462 - Not currently possible to limit the validity period of the assortment

Diagnosis
You attempted to maintain a validity period other than "today until themaximum date" for this assortment. This is not currently possible.
The fields are ready for input, but this is only to ensurecompatibility with developments that are planned in this area for thefuture.
Please use the status if you wish to limit the validity of anassortment.

System Response
The system always sets the start date to today and the end date to themaximum value.