Prevent B2B users being able to change the Company name when entering order details

Prevent B2B users (customers) being able to change the Company name when entering order details.

Delivery Address should be able to be changed, however Company name should not be able to be edited/changed by users (customers)

When a customer changes the company name a new SO Prefix is created. 

The link from Company to Orders is essentially broken from a reporting perspective, if not from a Cin7 x Xero sync.