Visibility of the reports (the section Reports - right side of the screen) on a company

Hello,

I need help for the next issues (We use the version 6.1 ):

1. I have developed a new type of invoice according with our needs, the invoice is visible on Accounting -> Customers/Suppliers -> Customer Invoices/ Supplier Invoices, click on an invoice, the section Reports (right side of screen- reports without wizard) The link of invoice is memored in the table "ir_values", and the report is memored in the table "ir_act_report_xml".
The report is not memored on the database, so I don't have any object , I can not use the Access Rules for some rights.
I need to hide the report (or the link of report) for some company.
I tried to use the attribute invisible, for eg. attrs="{'invisible':[('company_id','=','2')]}", but is not working (for buttons is working).

How should I modify the next code to hide the report for a company with name "RO" or any other name?

<?xml version="1.0"?>
<openerp>
<data noupdate="1">

    <record id="p5_internal_invoice_md_id" model="ir.actions.report.xml">
        <field name="name">P5 Internal Invoice MD</field>
        <field name="type">ir.actions.report.xml</field>
        <field name="model">account.invoice</field>
        <field name="report_name">p5_internal_invoice_md</field>
        <field name="groups">base.group_hr_user</field>
        <field name="report_type">aeroo</field>
        <field name="in_format">oo-ods</field>
        <field name="out_format">5</field>
        <field name="parser_loc">p5_report_internal_invoice_md/report/invoice_parser.py</field>
        <field name="report_rml">p5_report_internal_invoice_md/report/internal_invoice_md.ods</field>
        <field name="parser_state">loc</field>
        <field name="tml_source">file</field>
        <field name="groups">base.group_hr_user</field>
    </record>

    <ir_set>
        <field eval="'action'" name="key"/>
        <field eval="'client_print_multi'" name="key2"/>
        <field eval="['account.invoice']" name="models"/>
        <field name="name">Internal Invoice MD T11</field>
        <field eval="'ir.actions.report.xml,'+str(p5_internal_invoice_md_id)" name="value"/>
        <field eval="True" name="isobject"/>
        <field eval="True" name="replace"/>
        <field eval ="False" name="menu"/>
    </ir_set>

</data>
</openerp>

2. Another question is how can I make a report (the kind of report described at point 1) visible only for Internal Moves (Warehouse->Warehouse Management->Internal Moves) and invisible for the othes options in Warehosue Management.

3. The last question is about Accounting ->Cash and Bank->Cash Registers.
    A Cash register is opened, on line of a Cash Transactions I have a button that I need to hide for some companies.

   The button is on the object "account.bank.statement.line", if I use the next code , the button is hidden for a Cash transaction with field "Communication"=2.

  <?xml version="1.0" ?>
<openerp>
  <data>
    <!--
      changes to 'account.bank.statement.tree/form' views
      -->
     <record id="view_cash_statement_tree_voucher" model="ir.ui.view">
            <field name="name">account.cash.statement.voucher.tree.inherit</field>
            <field name="model">account.bank.statement</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="account.view_bank_statement_form2"/>
            <field name="arch" type="xml">
                <xpath expr="/form/notebook/page/field[@name='line_ids']/tree/field[@name='date']" position="before">
                    <button name="action_report" string="Report" type="object" icon="gtk-execute" attrs="{'invisible':[('name','=','2')]}"/>
                </xpath>
            </field>
        </record>

  </data>
</openerp>

If I use something like this attrs="{'invisible':[('company_id','=','5')]}", I have an error that tells me that the object "account.bank.statement.line"field has no field "company_id" .
So, how can I use for this case a field which is not member the object "account.bank.statement.line" ? I need to use the field "company_id" from the object "account.bank.statement".

Thank you very, very much for your answers!!!