I noticed that suitecrm does a duplicate check on creation of a new lead. If I’m correct the check is only done on the required field Last Name.
I thought by setting in the Studio another field as required like Account Name, that also on that field the duplicate check would be done.
But unfortunately that isn’t the case. 
Is there a way somehow to check on other fields on creation of the lead? I know there is Duplicate check but that is for existing records.
I am looking for the same thing I have tried a couple of things and have a post on it in the developer section, here is the link
https://suitecrm.com/forum/developer-help/12838-duplicate-check-onsave