Incorrect reduced price on product page with combinations

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Hi everyone. I'm using Prestashop 1.5.4.0. I was having an issue with reduced price on product page, but managed to sort it. Here is what I did...

 

My problem was:

I went to BO and set % reduction on a product which had a combination/s applied (size, color etc.). Everywhere in the shop (product list, cart, new products block) the reduced price was correct except the product page itself. It showed some weird price. However, amount reduction worked fine, as well as setting % on a product without combinations. So the problem had something to do with reducing price by percentage on a product with combinations. I also tried using the Product combinations generator, but it didn't help.

 

Solution:

I downloaded the new 1.5.5.0 installation. I copied this file: themes/default/js/product.js and pasted it in the same folder in my 1.5.4.0 shop (basically replaced my old file with the new one). And everything seems to be working correctly now.

 

I'm still testing my shop, so I don't know if this maybe affects something else along the way, but if it does, I will edit this post.

 

Hope this helps someone.