WooCommerce sale price is shown as regular price

Hi,

We are offering a discount for the main product when the associated product is selected. We need to display the total price in the product page, so we need to have “Change Price” enabled.
The problem is that then a default WooCommerce sale becomes not visible in the main product page – the sale price is shown as a regular price.
We need to have both: our ordinary sale with a strike-through regular price and the price which gets updated when the associated product is selected.

Could you suggest how to achieve that?

Thank you in advance!

Monika