BusinessUnit With Id = {ID} Does Not Exist

Hi all,

In my MS Dynamics CRM 365 organization I'm getting a pretty strange error when trying to create records of a custom entity. Basically, after clicking on "Save" I get the following error:

After downloading the error log, I see that the error is:

BusinessUnit With Id = {ID} Does Not Exist

The thing here is that I've disabled all plugins and Scripts related and I'm keep getting the same error. Also, I'm logged as System admin, so priviledges shouldn't be the problem.

Any workarounds?

Thanks in advance!