Credit memo for $0 order without refunded shipping produces negative credit memo

[wojtekn]

Preconditions

1. Clean 2.3.0
2. No sample data

Steps to reproduce

1. Create Cart Price Rule with 100% discount, applied to shipping, available for everyone
2. Create simple product with positive stock and price = $100
3. Place order in backend for the created product with qty =1 and flat rate shipping ($5 by default).
4. Invoice order (but don't create shipment)
5. Navigate to Credit Memo form
6. Change Refund Shipping from 5 to 0
7. Click "Refund Offline"

Expected result

1. Credit Memo with Total Refunded = 0 is created

Actual result

1. Credit Memo with Total Refunded = -$5.00 is created (negative value)

In Magento Commerce in the same case credit memo fails completely with "You can't use more store credit than the order amount." error. In Open Source it goes through with mentioned negative amount. As far as I see, in both cases behavior is incorrect.

[magento-engcom-team]

Hi @wojtekn. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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@wojtekn do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[wojtekn]

@magento-engcom-team give me 2.3.0+ instance

[magento-engcom-team]

Hi @wojtekn. Thank you for your request. I'm working on Magento 2.3.0+ instance for you

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

@engcom-backlog-nazar Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-97257, MAGETWO-97258 were created