Percentage discount on tier price and catalog price rule calculated on original price without selected options.

[mdkdev]

Preconditions and environment

• Magento <= 2.4.7

Steps to reproduce

For a clear example, use the following numbers:

Product Price: 1000
Tier Price: 50% Discount
Custom Option Value: -500

• Configure a simple product with a price (1000) and a custom option with at least two values. Set one of the price of the values to 0, and another one to a negative number (-500).
• Set a tier price with a percentage discount (-50%)
• Go to the frontend, and visit the product. Select the negative custom option value, and the qty that was set on the 50% tier price.

Expected result

The tier price discount is calculated on the price including the custom options. For example:

(1000 - 500) / 2 = 250

Where 1000 is the original product price, 500 is the negative custom option value and 2 is the 50% discount from the tier price.

Actual result

The tier price is calculated based on the original product price without the selected custom options.

(1000 - 500) - 500 = 0

Where 1000 is the original product price, 500 is the negative custom option value and the other 500 is 50% of the original product price (1000).

Additional information

Screencast:
https://github.com/magento/magento2/assets/6543944/41b32739-a861-40b8-8a21-19c562a48c03

Scenario:2

The same problem occurs when a catalog price rule is set to (for example) a specific customer group. The discount is then deducted from the original price, which means that the following example results in a 0,- total:

Original Product Price: 1000.00
Cart Price Rule: -50%
Custom Option Price: -500

Total Price: (1000 / 2) - 500 = 0.00

This should be a 50% discount on the configured product:

Total Price: (1000 - 500) / 2 = 250.00

magento_cart_price_rule_custom_options.mp4

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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[engcom-Delta]

Hi @mdkdev ,

Verified the issue on latest 2.4.7 and 2.4-develop, it is reproducible.

Hence, Confirming the issue.

Steps to reproduce:-

1.Configure a simple product with a price 1000
2.Set a tier price with a percentage discount (50%)
3.Set custom option with at least two values, one of the price of the values to 0, and another one to a negative number -500.
4.Go to the frontend, and visit the product.
5.Select the negative custom option value, and the qty that was set on the 50% tier price.

Actual Result:

The tier price is calculated based on the original product price without the selected custom options.

(1000 - 500) - 500 = 0

Where 1000 is the original product price, 500 is the negative custom option value and the other 500 is 50% of the original product price (1000).

Screen.Recording.2024-05-24.at.2.mp4

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-12004 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Delta. Thank you for verifying the issue.
Issue Available: @engcom-Delta, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[mdkdev]

Hi @engcom-Delta,

Thank you for confirming the issue. The same problem occurs when a catalog price rule is set to (for example) a specific customer group. The discount is then deducted from the original price, which means that the following example results in a 0,- total:

Original Product Price: 1000.00
Cart Price Rule: -50%
Custom Option Price: -500

Total Price: (1000 / 2) - 500 = 0.00

This should be a 50% discount on the configured product:

Total Price: (1000 - 500) / 2 = 250.00

magento_cart_price_rule_custom_options.mp4

Should this be added to a new issue, or is this the right place?

Thank you.

[digitalrisedorset]

@magento I am working on this

[engcom-Delta]

Hi @engcom-Delta,

Thank you for confirming the issue. The same problem occurs when a catalog price rule is set to (for example) a specific customer group. The discount is then deducted from the original price, which means that the following example results in a 0,- total:

Original Product Price: 1000.00 Cart Price Rule: -50% Custom Option Price: -500

Total Price: (1000 / 2) - 500 = 0.00

This should be a 50% discount on the configured product:

Total Price: (1000 - 500) / 2 = 250.00

magento_cart_price_rule_custom_options.mp4
Should this be added to a new issue, or is this the right place?

Thank you.

Hi @mdkdev ,

I have updated the main description and added the scenario in additional information.

Thanks,

[digitalrisedorset]

Hi, I have looked into this issue. The problem is narrowed to 2 javascript files:

• app/code/Magento/Catalog/view/base/web/js/price-options.js
• app/code/Magento/Catalog/view/base/web/js/price-box.js
  Particularly, the method updateProductTierPrice in the price-box.js file calls updatePrice once the tier prices changes are applied
  And then the updatePrice method handles the custom options price changes.

My understanding is: we want to inverse this calculation. We want instead the custom option prices to be performed first and then the tier prices would be adjusted after.

These 2 files have their logic intertwined with their UI. Some event subscribers seem to interact from one price to another price type.. I would like enquire on possible documentation to gain awareness of design/architecture around the price calculation on the product detail page. Would we have a diagram to understand the flow with the prices data and the UI on the product page?