If two users edit the same In Progress payment, and both delete it by pressing Cancel, the second user will receive an error like “Failed to delete object with reference act.customerAccountPayment:6483736:62b2d4bc-48a3-11ee-a690-fd749b8b2bae".

To reproduce:
1. Go to Customers - Payments
2. Create an In Progress payment, with a single EFT line item.
3. Click Apply
4. In another window, edit the payment. Click Cancel.
A prompt will be displayed: “This Payment has been saved. Do you want to delete it?”
Click Yes
5. In the first window, Click cancel, and click Yes at the prompt.

An error like the following will be generated (this stack from a 2.4-alpha-14 error report):