This issue relates to i21 Help Desk ticket. Click the link below to go to Help Desk ticket.
HDTN-223200 - Editing of POS invoice doesn't recognize special pricing
v18.3.0108.612
Steps to reproduce:
1. Restore latest backup. See environment.
2. Process a POS invoice item #1077870 and pay on account.
3. Unpost the original POS invoice, removed the item, re-select the item.
Actual result: