[TYPO3] RealURL and comma separated values in tt_products

[Alexander]

Hello list.
I have a question about RealURL extension. I'm using it with some 
extensions including tt_products. I'm already tuned up realUrl for my 
needs. But i found one thing that annoying me. tt_products has 
possibilities to show all products in a subcategories. In this case url 
without RealURL extension looks like this:

....tx_ttproducts_pi1[cat]=8%2C19%2C20%2C21%2C22%2C23%2C24%2C25%2C26%2C27%2C28

- categories IDs with comma separated values. When I turning on RealURL 
paths looks like this:

...catalogue/goods/categories/displays/

Looks good, but nonfunctional because it doesn't show any product.

If someone found solution for this, please post.

Thanks for any advice.

Alex.