Error While Changing Price Indicator From 'S' to 'V'..!!

Hello Experts

I am facing problem while changing price indicator of material from 's' to 'v' with valuation category 'X- Automatic batch' but the system doesn't allow me to do this change.

I have already met all the prerequisites like Stock = 0, All open documents closed.

I am getting error 'Batches already exist' ,i have set the deletion flag for batches but this doesn't solve the problem.

I know i have option to do batch archiving, Is this the only approach or there is some any other solution ? If i do batch archiving can we restore the deleted batches ?

Please help as i have to do this activity for around 1500 materials ...!!

Regards,

Amit Sharma