cross-price elasticity

I am doing some research in cross-price elasticity and I have the following question.

How do you account for inter-correlation of two products? Say that you have product A and product B and that you find there is a significant cross price effect between the price of product B and the volume of product A. The mistake here is that we are ignoring the correlation between the price of A and price of B. If every time you raise the price of product B you also raise the price of product A then the cross-price elasticity between B and A may be misguided because it is really dependent on the price of A.

Is there a way to adjust the result based on the correlation between the price of A and B?