[6.0] hr_payroll_account hr_payroll_account_view.xml - required fields block opening form

the following code blocks opening "Employees" if employees are imported before installing
hr_payroll_account - the fields are obviously empty.

                    <page string="Accounting">
                        <field name="property_bank_account" required="1"/>
                        <field name="salary_account" required="1"/>
                        <field name="employee_account" required="1"/>

in practice I have seen many cases where no bank account is available (peolpe get paid in cash)

BTW how can this module be installed in a running installation if no defaults are given?