Negative Discounts not calculating as expected

We are utilizing negative discounts to add to our product prices. We are doing this because it is much easier to maintain than 3 prices for each of over 300 products. We used to do it that way. However, when prices change from our supplier it was a nightmare to update (terribly time-consuming). Doing it with negative discounts allows us to create a global markup system while also allowing us to track the 'cost' of the products within Hikashop - which is very convenient.

However, the negative discounts are not overriding each other as expected.

For instance, we are using the following custom ACL groups (each discount restricted to the same product categories):

Public Discount: -$15 (adds $15)
Employee Discount: -$10 (adds $10)
Cost Discount: -$2.50 (adds ($2.50)

Example Product Price: $10

If a user is a member of the Employee and Cost group, they receive the Employee price ($20) not the lower Cost price ($12.50).

Since -$2.50 is 'larger' than -$10 we would expect the price to be $12.50

We can only get it to work if users are members of the Cost OR Employee group - which is not practical. Members of the Cost group are always Employees.

Pls advise.

Thank you,
Dustin

Thank you. In making this change I'm assuming it will be overwritten when the extension is updated and will have to be re-applied?

Just a quick update to let you know that we have been using the negative discounts for some time on our production site and they seem to be working fine. Do you know if these will continue to work in the future? Really hoping so, we have a lot of products relying on this functionality.

Thank you,
Dustin