@Harry Do you have any customizations implemented for the Customers screen?
Additionally, have you tried to un-publish the customizations and verified the same?
Please review @Naveen Boga suggestions and also verify if this ID has been used any where in the system like vendors.
Try to unpublish the cusotmization and verify the change ID.
Also follow below suggestions
This is a very common error for Acumatica.
Usually this happens for a few reasons:
- another user is trying to change something on that record.
- That record is open on another /Mutliple tab.
- A user tried to do the same action twice.
Try to clear your cache and close all tabs and update the record again.