Pricing procedure & condition types

Hello,

I have a simple requirement that consists in redetermine the pricing procedure and it's condition types for a particular invoice:

The is a simple FM that gives me the pricing conditions (values): RV_INVOICE_DOCUMENT_READ ( in stucture XKOMV).

So far so good, but imagine that i change a pricing condition, in tcode VK12, for the same date.

what i want is to redetermine the value of this pricing condition !

I'm using FM: Pricing ( calculation type = 'C') but with no sucess. It doesnt give me the entire conditions in the pricing procedure as well as they dont have values.

Do you have a solution? Can you provide some examples?

Best regards,