Preconditions:

Added and configured PayU gateway.

Steps to reproduce

1. Go to storefront page {host}/product-catalog
2. Make an order.
3. Pay for an order using PayU payment method.
4. Go to Storefront / User / Orders / order details       {host}/user/order{orderId}
5. Check Payment status (should be 'Paid').
6. Click on 'Cancel' button.

Actual result:

Cannot cancel paid order from order details on storefront because an error 400 occurs.

Argument '$updateStruct->transition' is invalid: Transition "cancel" from "paid" status is not allowed 

Expected result:

User can cancel paid order when order status is pending.