Symptoms

The error "The button 'Business unit must be found in database' refers to a rule that is disabled" occurs in an attempt to save Document Definition.

Cause

The rule "Business unit must be found in database" is disabled in the Document Definition. 

Resolution

In order to resolve the issue, it is required either to enable the rule or remove the Find button.

To enable the rule, follow these steps:

1. In the Document Definition Editor open BU group properties and navigate to the Rules tab.
2. Set Show rules parameter as "owned by BU".
3. Enable the rule named "Business unit must be found in database" as on the screenshot below:

If you want to disable the rule, but still receive an error on Document Definition saving, the Find button should be removed from the form:

The same situation is valid for the rule "Vendor must be found in database".