Currently, when you create a quote in CRM, the field "Subject" is mandatory.  The properties of a system defined field cannot be edited which means we cannot de-select the mandatory requirement.  

A 'subject' on a quote is a little vague and not something we typically use (we don't, others may), but at it's core it should not be a default mandatory field as it's not used as a key.  

IDEA: change the field so that it can be defined as either mandatory, or not mandatory, depending on user preference.  

OUTCOME: for some industries, a "subject" on a quotation is a bit of a strange concept and is confusing for both the person creating/generating the quotation and the customer receiving the quotation.