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Error when returning part of order to which manual discount applied

Found in

EPiServer.Commerce 12.3.1

Fixed in

EPiServer.Commerce 12.5.0

(Or a related package)

Created

Jun 27, 2018

Updated

Jul 30, 2018

State

Closed, Fixed and tested

Description

Steps to reproduce

  1. Go to CommerceManager.
  2. Create a new order with 3 items (A) that has manual discount (no other discounts).
  3. Complete the order.
  4. Create a return order for 1 of item A

Expected:
Can return 1 item A normally.

Actual:
Exception Details: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.