Version 9.0c (Community Edition)
I'm just playing with odoo, making tests before the real work starts. I created a table, then the related menu. After a while I decided to delete the menu, but I got this validation error:
Odoo Warning - Validation Error
The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set
[object with reference: wizard.ir.model.menu.create - wizard.ir.model.menu.create]
I spent some time searching for the reason, deleting the submenu (on the right), but I couldn't sort it out.
The funny is that few minutes before I deleted another test-menu with no problems.
TIA for your support
Because this error points to a data integrity issue I don't think the cause is the deleted menue! In other words the operation is harming the data model of your or other tables.