l10n_cl_account_vat_ledger/security/security.xml
<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data noupdate="0">
<record model="ir.rule" id="multi_company_vat_ledger">
<field name="name">Point Of Sale Multi Company</field>
<field name="model_id" ref="model_account_vat_ledger"/>
<field name="global" eval="True"/>
<field name="domain_force">['|',('company_id','=',False),('company_id','child_of',[user.company_id.id])]</field>
</record>
</data>
</openerp>