Set Analysis - Greater then Date

[#1]

Hi all,

I have the following problem. I must determine the number of (following) orders from customers who have purchased a particular (selected) product in the first order.

At the moment I have a feeling that my Set Analysis formula ignored the part with order_date.

Count({1<customer_id=P({<first_order={'Y'},product_id=P(product_id)>} customer_id),order_date={">$(=Date({1<first_order={'Y'},product_id=P(product_id)>} order_date))"}>} DISTINCT order_id)

Can you please look at you the formula.

Thanks

[#2]

Is there any way to depict  " order_date> P () " in Set Analysi?