Company Number (TIN) --- Where Is It?

Hello everyone,

I need to pull the company number --- also known as a 'TIN' --- of an org unit as defined in the Organisational Management > Org Structures view (see the redacted picture below --- the desired field is highlighted in red) onto a form. I definitely have the right Org Unit ID, as I tested it by printing it on the form I'm using. However, when I set up an AfterModify scipt to search the CompanyTaxArrangement business object's 'Tax Identification Number' collection using the UUID of the org unit, it says the collection is empty. So if the company number (TIN) isn't in there, where is it?

Thanks,

Lewis