server-tools/email_template_template/view/email_template.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="email_template_form" model="ir.ui.view">
            <field name="name">email.template.form</field>
            <field name="model">email.template</field>
            <field name="inherit_id" ref="email_template.email_template_form" />
            <field name="type">form</field>
            <field name="arch" type="xml">
                <data>
                    <field name="name" position="after">
                        <field name="is_template_template" invisible="1" />
                        <field name="email_template_id" domain="[('email_template_id', '=', False), ('model_id', '=', %(email_template.model_email_template)s)]"
                            attrs="{'readonly': [('is_template_template','=',True), ('email_template_id','=',False)]}"
                            context="{'default_model_id': %(email_template.model_email_template)s}"
                            />

                    </field>
                    <field name="model_id" position="attributes">
                        <attribute name="attrs">
                            {'readonly': [('is_template_template','=',True)]}
                        </attribute>
                    </field>
                    <field name="email_from" position="attributes">
                        <attribute name="required">0</attribute>
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                     <field name="email_to" position="attributes">
                        <attribute name="required">0</attribute>
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                     <field name="email_cc" position="attributes">
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                     <field name="email_bcc" position="attributes">
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                     <field name="reply_to" position="attributes">
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                    <field name="lang" position="attributes">
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                    <field name="user_signature" position="attributes">
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                     <field name="subject" position="attributes">
                        <attribute name="required">0</attribute>
                        <attribute name="attrs">
                            {'readonly': ['|',('is_template_template','=',True),('model_id', '=', %(email_template.model_email_template)s)]}
                        </attribute>
                    </field>
                 </data>
            </field>
        </record>
    </data>
</openerp>