Material Planned Prices - Sales Order Costing

Dear CO friends,

The “Costing view” of the material master record, has 3 sets of fields for the “Planned Price” and “Date from”.

There is no “Date To” field.

The actual scenario is that the Planned price 1 is valid for a specific period of time. At the end of this period I need the Planned price to be deactivated (equal to zero).

The system prohibes the entry of Planned price = 0.

Planned Price Date From Date To (does not exist)

120€ 01/02/07 31/03/07

0€ 01/04/07 31/12/9999 Price 0 Not allowed

Are there any ideas how to implement the above?

Thanks in advance for yr time.

Regards,

Elly