I have to check if sales happened for every unique customer in the next quarter.
Condition1: For a speciafic customer if a product sold in a quarter and a different product being sold for same customer in next quarter then I have to flag it cross sell.
Condition2: Above condition of cross sell only hold if sell happens of a different product for same customer in next quarter not previous previous quarter.
I am attaching screenshot where result column has the desired output.