API salesRefundInvoiceV1 does no save invoice ID on credit memo

[AntonEvers]

Preconditions

1. Magento branch 2.2-develop

Steps to reproduce

1. Place an order with an online payment method (Paypal)
2. Create an online invoice for the order
3. Use API method salesRefundInvoiceV1 to create a refund for the invoice

Expected result

1. Because I'm refunding an invoice, I'd expect the invoice ID to be saved on the credit memo.
2. When I create a credit memo from the invoice in the admin pages, the invoice ID is saved on the credit memo

Actual result

[magento-engcom-team]

@ajpevers, thank you for your report.
We've created internal ticket(s) MAGETWO-82601 to track progress on the issue.

[okorshenko]

The issue has been fixed and delivered to 2.2-develop branch. Will be available with upcoming patch release