Co-written with Vishal Kohli, based on a shared troubleshooting session.
When creating a new store in the Store Master in Dynamics 365 for Finance and Operations, you may hit:
Cannot create a record in Global address book (DirPartyTable). The record already exists.
The message is misleading. The actual problem is that the operating unit number you keyed in already exists in the system — it has nothing to do with the address book record itself. Make sure you're entering a number that isn't already in use.
You're most likely to hit this when your operating unit number sequence is configured as Manual, since nothing stops you from typing in a duplicate.