Only price control "V" is possible for split valuation'

Hi

For semi finished items price control has been assigned as 'V'.when i am trying to change the same to S' I got the error message is"Only price control "V" is possible for split valuation''.Even i checked and corrected the MRP views in Material master.

Can any one help me to sort out this issue

Regards,

P.Selvakumar