Implication if we mark address field as non mandatory?

Navigation: Procurement >> Supplier >> Edit Address.

We would like to mark suburb fields as non mandatory. We do not understand why oracle has marked suburb field as mandatory by default.

Navigation: Setup and Maintenance » Manage Address formats

I think if we mark the suburb field as non mandatory, it will fix our issue of non putting any data in the field. However we would like to know whether it could cause any negative impact on other default reports for taxation,etc?