Groovy script to check Item catalog

Summary:

Is there a way with a groovy script to check if the attached field is equal to a value ('INTRANSTAT' for example) in order managemnt extension.

So if the value is present I get a message On Save.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):