[ic] disable sale_price

[interchange-users@icdevgroup.org (Chen Naor)]

Hi,
Using IC 4.8.6.

In the site I  managing we use the sale_price to give the clients a regular
discount (about 85% of the products have this discount).
I added a coupon system base on product discount - it can be an amount coupon or
percents.
We want the coupon discount to be calculate from the price field not from the
sale_price field.
If I calculate the [discount item] coupon amount [/discount] and the item have a
sale price, I get a double discount: sale_price + coupon.
Is there a way to disable the sale_price while using the [discount] tag?

Thanks

Chen