Order Total is becoming negative value during checkout if discount is greater than Cart value

[engcom-November]

Preconditions (*)

1. Magento 2.4-develop

Steps to reproduce (*)

1. Create Cart Price Rule with Action "Fixed amount discount for Whole Cart" and amount $100
2. Stores - Settings - Configuration - Sales - Tax - Calculation Settings - 'Apply Customer Tax' Set to "After Discount", Apply 'Discount On Prices' - "Including Tax" - Save Config
3. Default Tax Destination Calculation - Germany
4. Stores - Settings - Configuration - Sales - Shipping Methods - Enable Free Shipping
5. Create 3 Tax Rules (Ex: US ex: 8.25% tax rate and Germany 2 rules : 19% and 7%)
6. Reindex and clear cache
7. Create a Product so that whole cart value is < 100 . (Ex: Created product with amount $40)
8. Front-end Login as Customer - Add Product to Cart
9. Ship to US/Germany Address, Apply Discount - Payment Step

Expected result (*)

Order Total should become 0

Actual result (*)

Order Total is becoming negative value. On submitting the order, below error message is displayed.

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• [ ] 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[bot]]

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[m2-assistant[bot]]

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[engcom-Delta]

@magento give me 2.4-develop instance

[magento-deployment-service[bot]]

Hi @engcom-Delta. Thank you for your request. I'm working on Magento instance for you.

[magento-deployment-service[bot]]

Hi @engcom-Delta, here is your Magento Instance: https://dacab05c4880d265767ee7799c1ef90a.instances.magento-community.engineering Admin access: https://dacab05c4880d265767ee7799c1ef90a.instances.magento-community.engineering/admin_3080 Login: 1089f396 Password: 77bf1a6c6335

[engcom-Delta]

Hi @engcom-November , We tried to reproduce the issue on Magento 2.4.Develop latest branch , issue is reproducible for Germany Country Whereas for US shipping address it did not show negative value during checkout. Hence confirming the issue .

Steps followed:

1. Create Cart Price Rule with Action "Fixed amount discount for Whole Cart" and amount $100
2. Stores - Settings - Configuration - Sales - Tax - Calculation Settings - 'Apply Customer Tax' Set to "After Discount", Apply 'Discount On Prices' - "Including Tax" - Save Config
3. Default Tax Destination Calculation - Germany
4. Stores - Settings - Configuration - Sales - Shipping Methods - Enable Free Shipping
5. Create more than one Tax Rule (Ex: US and Germany - 19% and 7%)
6. Reindex and clear cache
7. Create a Product so that whole cart value is < 100 . (Ex: Created product with amount $40)
8. Front-end Login as Customer - Add Product to Cart
9. Ship to US/Germany Address, Apply Discount - Payment Step

Create more than one Tax Rule (Ex: US and Germany - 19% and 7%)

[github-jira-sync-bot]

:white_check_mark: Jira issue https://jira.corp.magento.com/browse/AC-2570 is successfully created for this GitHub issue.

[m2-assistant[bot]]

:white_check_mark: 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.

[engcom-November]

Issue will not be fixed and is cancelled with below reasons:

1. During configuring, there is sufficient warning to the merchant that they are performing some configurations that could lead to problems. Being even more stringent and stopping the merchant from proceeding with their configuration would require substantial effort on definition and also implementation. We would probably have to check all prices in the catalogue to check if the minimum price was less than the total cart discount and also the combinations of the discount calculations including or not tax, as well as the tax calculations taking place after discount applied. Altogether, quite a complex scenario for what appears to be somewhat of an edge case caused by trying to configure the store incorrectly.
2. During checkout: the value shown is < 0 and this does indeed look silly. But what could be a solution? Making the order amount to be zero when the order value total is <0? That could be a solution but it could imply that shoppers start to see zero value orders and order many items rapidly, thereby cleaning out the merchant for what is probably an error. So in this case, I would also err on the side of caution and keep the order from being completed. At least this way, the merchant does not run the risk of having unexpected zero-value orders and they should relook at their configuration and configure their store correctly, creating cart discounts which correspond with the minimum prices of their products.