# Compute based on pricetype of employee company
pricetype_id = self.pool.get('hr.employee').browse(cr,uid,employee_id).user_id.company_id.property_valuation_price_type.id
+ context['currency_id']=self.pool.get('hr.employee').browse(cr,uid,employee_id).user_id.company_id.currency_id.id
pricetype=self.pool.get('product.price.type').browse(cr,uid,pricetype_id)
amount_unit=product.price_get(pricetype.field, context)[product.id]