>Hello, i have 2 tables, 1 table have the properties from a object, and second table have the information for working with users, like invoice_properties and invoice , i need create a business object for every table?,

Typically you create a business object for every table you need to add/edit/delete records in. It is common though to have bizobj derived from this framework that containg more than one table or view... but usually the extra tables/views are for lookup purposes only. If you need to add/edit/delete records in two or more tables/views that are related, you probably want to look at doing parent and child business objects which the frameowrk handles very well. HTH