So, I'm completely new to Nintex / SharePoint related stuff.
I would like to compare the user input in a Nintex Forms field to already existing items in the same list.
Maybe my example will make it somehow clearly.
In a contact list, I got the column 'company name'.
When a user tries to create a new contact, and puts the company name 'Smith' in the field, I'd like the field to check the contents of the column 'company name', wheter the company name already exists or not.
Note: The user should still be able to create the contact, it should just be a reminder / note that this company name is already in the list.
Any help or tips are appreciated.