title: Field `insurance_primary_wage` does not exist
body: <blockquote>
    <p>Field <code>insurance_primary_wage</code> does not exist</p>
    
    <p>Error context: View <code>hr.contract.form</code> [view_id: 466, xml_id:
    Egy_Salary_Insurance.hr_contract_view_form, model: hr.contract,
    parent_id: n/a] None" while parsing
    /home/whammam/Odoo12/extra/Egy_Salary_Insurance/views/hr_contract_insurance_views.xml:4,
    near</p>
  
  <pre><code>    &lt;record id="hr_contract_view_form" model="ir.ui.view"&gt;
          &lt;field name="name"&gt;hr.contract.form&lt;/field&gt;
          &lt;field name="model"&gt;hr.contract&lt;/field&gt;
          &lt;field name="arch" type="xml"&gt;
              &lt;form string="Current Contract"&gt;
                  &lt;sheet&gt;
                      &lt;notebook&gt;
                          &lt;page string="Salary Information" name="information"&gt;
                              &lt;group name="main_info"&gt;
                                  &lt;group name="salary_and_advantages" string="Monthly Advantages in Cash"&gt;
                                      &lt;label for="wage"/&gt;
                                      &lt;div class="o_row" name="wage"&gt;
                                          &lt;field name="wage" nolabel="1"/&gt;
                                          &lt;span&gt;/ month&lt;/span&gt;
                                          &lt;field name="insurance_primary_wage"/&gt;
                                          &lt;field name="insurance_variable_wage"/&gt;
                                          &lt;field name="total_insurance_wage"/&gt;
                                          &lt;field name="insurance_subscription"/&gt;
                                      &lt;/div&gt;
                                      &lt;field name="advantages" nolabel="1" placeholder="Advantages..." colspan="2" invisible="1"/&gt;
                                  &lt;/group&gt;
                              &lt;/group&gt;
                          &lt;/page&gt;
                      &lt;/notebook&gt;
                  &lt;/sheet&gt;
              &lt;/form&gt;
          &lt;/field&gt;
      &lt;/record&gt;
  </code></pre>
  </blockquote>