I have a custom module and created a custom paperformat.

__openerp__.py

{
    'name': " POS Template",
    'author': "Ashiong",
    'version': '1.0',
    'description': """
    - Test
    """,
    'depends': ['stock',
                ],
    'data': [
            'data/report_paperformat.xml',
            'views/delivery_receipt_report.xml',
            'views/picking_report.xml',
    ],
    'auto_install': False,
}

picking_report.xml

        <report             
            id="action_report_delivery_receipt"             
            string="Delivery Receipt (Test POS)"
            model="stock.picking"
            report_type="qweb-pdf"
            name="my_module.test_delivery_receipt"
            file="my_module.test_delivery_receipt"
        />

        <record id="action_report_test_delivery_receipt" model="ir.actions.report.xml">
            <field name="paperformat_id" ref="my_module.test_pos_paperformat"/>
        </record>

report_paperformat.xml

    <!-- POS --> 
       <record id="test_pos_paperformat" model="report.paperformat"> 
        <field name="name">Test Paperformat</field> 
        <field name="default" eval="True" /> 
        <field name="format">custom</field> 
        <field name="page_height">150</field> 
        <field name="page_width">60</field> 
        <field name="orientation">Portrait</field> 
        <field name="margin_top">3</field> 
        <field name="margin_bottom">3</field> 
        <field name="margin_left">3</field> 
        <field name="margin_right">3</field> 
        <field name="header_line" eval="False" /> 
        <field name="header_spacing">3</field> 
        <field name="dpi">130</field> 
       </record>

Once I install my custom module, the system will return an error message:

ParseError: "null value in column "name" violates not-null constraint
DETAIL:  Failing row contains (710, 1, 2017-08-10 10:18:05.557211, null, 1, 2017-08-10 10:18:05.557211, null, ir.actions.report.xml, null, null, t, pdf, null, null, null, null, t, null, f, null, null, null, f, null, 28, 80, null, 1, database, null, null, 1, off, utf_8, f, class Parser(report_sxw.rml_parse):
    def __init__(self, cr, u..., static, f, default, default, null, t, f, null, oo-odt, null).
" while parsing /home/custom_addons/my_module/views/picking_report.xml:13, near
<record id="action_report_pos_delivery_receipt" model="ir.actions.report.xml">
            <field name="paperformat_id" ref="my_module.test_pos_paperformat"/>
        </record>