I have created a custom field that is mandatory / required when a new contact is input into the database. The problem I see is that when I input the contact person into the lead and PD offers to have the contact added as a new contact it doesnt take into account the rule (custom field) I created as required and the lead is allowed to be set and the new contact added without the user being prompted to choose an option for the required field. 

Do i have to make a new custom field as an exact same copy of the one I just spent time making for the person details and add it as its own custom field in the Lead/deal data fields section?