I am running magento 22.214.171.124.
If the customer orders 3 products (payment - bank transfer) and I create credit memo for 1 product, then calculated prices will be displayed correctly in new credit form, but after button „Refund offline“ whole order will be canceled.
$_canRefund and $_canRefundInvoicePartial = TRUE
How can I fix this issue?
I guess the problem is the model of that payment method is not applying an override to the abstract class, so the refund is total: https://github.com/OpenMage/magento-mirror/blob/magento-1.9/app/code/core/Mage/Payment/Model/Method/...
Maybe the easiest way could be to create a custom payment method with the same options but the partial refund.