VPRS- condition type

Hi,

I have a strange requirement. Recently I have updated VPRS condition in my sales order for COGS determination in the Profitability report.

Now the client wants the data for July till date into the report.

In my opinion I dont think I can determine material cost for my previous orders when the VPRS condition typ was not incorporated.

Does anyone has any idea about the best possible solution?

Regards

Ashish