Hi,

Which version are you working on ? 

If you're in developper mode, you should be able to look at the name of the field for vendor or customer.

Easiest way to hide it for non customers is to add a domain in your XML.

For example in the field declaration (field name="your_field") you can add attrs="{'invisible': [('user_type', '!=', 'customer')]}"

Don't forget to replace user_type by the correct field name.

Hope it will help