Sales order Classification - valid from taking Delivery date

Hello All,

Business scenario is -

Variant Configuration is set up with all the available options for sales order.

Business added new selection option and change the Class using Change Number with Valid from date - 1 Dec 2015.

When I create the sales order and put the delivery date before 1 Dec 2015 system dint show me that Option and vice versa.

My client requirement is that the valid from date of the newly added option should not be control by delivery date, It should take the pricing date into consideration for the valid from date for the new option.

Any suggestion.

Thanks

SachinD