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In my sales order invoice template I get only one variant attribute of a product.I want to print all variants of a product in my    invoice template.I  tried this below code in report_invoice_document

<t t-set="itr" t-value="0"/> 
      <tr t-foreach="o.invoice_line_ids" t-as="l">
             <t t-set="itr" t-value="itr+1"/>
             <td><t t-esc="itr"/></td>
             <td><span t-field="l.name"/>||<span t-field="l.product_id.product_variant_ids"/>
                    <span t-field="l.product_id.is_product_variant"/>||<span t-field="l.product_id.attribute_line_ids"/>||
                    <span t-field="l.product_id.attribute_value_ids"/></td>

and I get the output               

[456] pants (Blue, Small)||product.product(2,)True||product.attribute.line(10, 11)||product.attribute.value(1, 4)

                   
Is there any solution to solve this ??

..py file

class mrp_product_produce(osv.osv_memory):
    _inherit = "mrp.product.produce"

    _columns = {
        'test': fields.char('test')
    }

…xml file

 <record id="view_mrp_product_produce_wizard_sss" model="ir.ui.view">
            <field name="name">MRP Product Produce</field>
            <field name="model">mrp.product.produce</field>
            <field name="inherit_id" ref="mrp.view_mrp_product_produce_wizard"/>
            <field name="arch" type="xml">
                <data>
                	<xpath expr="(//field[@name='product_id'])[2]" position="after">
                		<field name="test"/>
                    </xpath>
                </data>
            </field>
        </record>

gives next error ;-(

2016-01-21 11:06:12,725 6351 INFO db_20160107 openerp.modules.module: module SSS_po_project_task: creating or updating database tables
2016-01-21 11:06:13,758 6351 INFO db_20160107 openerp.modules.loading: loading SSS_po_project_task/views/mrp_view.xml
2016-01-21 11:06:14,347 6351 ERROR db_20160107 openerp.addons.base.ir.ir_ui_view: Veld test` bestaat niet

Fout context:
Weergave`MRP Product Produce`
[view_id: 1288, xml_id: SSS_po_project_task.view_mrp_product_produce_wizard_sss, model: mrp.product.produce, parent_id: 907]
2016-01-21 11:06:14,348 6351 DEBUG db_20160107 openerp.models: Exception while validating constraint
Traceback (most recent call last):
File "/media/disk2/workspace/odoo8_sss/openerp/models.py", line 1251, in _validate_fields
valid = valid or fun(self._model, cr, uid, ids)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 202, in _check_xml
self.postprocess_and_fields(cr, uid, view.model, view_doc, view.id, context=context)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 806, in postprocess_and_fields
fields_def = self.postprocess(cr, user, model, node, view_id, False, fields, context=context)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 716, in postprocess
fields.update(self.postprocess(cr, user, model, f, view_id, in_tree_view, model_fields, context))
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 716, in postprocess
fields.update(self.postprocess(cr, user, model, f, view_id, in_tree_view, model_fields, context))
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 643, in postprocess
xarch, xfields = self.postprocess_and_fields(cr, user, field.comodel_name, f, view_id, ctx)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 832, in postprocess_and_fields
self.raise_view_error(cr, user, message, view_id, context)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 360, in raise_view_error
raise AttributeError(message)
AttributeError: Veld test` bestaat niet

Fout context:
Weergave`MRP Product Produce`
[view_id: 1288, xml_id: SSS_po_project_task.view_mrp_product_produce_wizard_sss, model: mrp.product.produce, parent_id: 907]
2016-01-21 11:06:14,362 6351 ERROR db_20160107 openerp.http: Exception during JSON request handling.
Traceback (most recent call last):
File "/media/disk2/workspace/odoo8_sss/openerp/http.py", line 537, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/media/disk2/workspace/odoo8_sss/openerp/http.py", line 574, in dispatch
result = self._call_function(**self.params)
File "/media/disk2/workspace/odoo8_sss/openerp/http.py", line 310, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/service/model.py", line 118, in wrapper
return f(dbname, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/http.py", line 307, in checked_call
return self.endpoint(*a, **kw)
File "/media/disk2/workspace/odoo8_sss/openerp/http.py", line 803, in __call__
return self.method(*args, **kw)
File "/media/disk2/workspace/odoo8_sss/openerp/http.py", line 403, in response_wrap
response = f(*args, **kw)
File "/media/disk2/workspace/odoo8_sss/addons/web/controllers/main.py", line 948, in call_button
action = self._call_kw(model, method, args, {})
File "/media/disk2/workspace/odoo8_sss/addons/web/controllers/main.py", line 936, in _call_kw
return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/module/module.py", line 534, in button_immediate_upgrade
return self._button_immediate_function(cr, uid, ids, self.button_upgrade, context=context)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/module/module.py", line 495, in _button_immediate_function
registry = openerp.modules.registry.RegistryManager.new(cr.dbname, update_module=True)
File "/media/disk2/workspace/odoo8_sss/openerp/modules/registry.py", line 370, in new
openerp.modules.load_modules(registry._db, force_demo, status, update_module)
File "/media/disk2/workspace/odoo8_sss/openerp/modules/loading.py", line 351, in load_modules
force, status, report, loaded_modules, update_module)
File "/media/disk2/workspace/odoo8_sss/openerp/modules/loading.py", line 255, in load_marked_modules
loaded, processed = load_module_graph(cr, graph, progressdict, report=report, skip_modules=loaded_modules, perform_checks=perform_checks)
File "/media/disk2/workspace/odoo8_sss/openerp/modules/loading.py", line 176, in load_module_graph
_load_data(cr, module_name, idref, mode, kind='data')
File "/media/disk2/workspace/odoo8_sss/openerp/modules/loading.py", line 118, in _load_data
tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)
File "/media/disk2/workspace/odoo8_sss/openerp/tools/convert.py", line 901, in convert_file
convert_xml_import(cr, module, fp, idref, mode, noupdate, report)
File "/media/disk2/workspace/odoo8_sss/openerp/tools/convert.py", line 987, in convert_xml_import
obj.parse(doc.getroot(), mode=mode)
File "/media/disk2/workspace/odoo8_sss/openerp/tools/convert.py", line 853, in parse
self._tags[rec.tag](self.cr, rec, n, mode=mode)
File "/media/disk2/workspace/odoo8_sss/openerp/tools/convert.py", line 763, in _tag_record
id = self.pool['ir.model.data']._update(cr, self.uid, rec_model, self.module, res, rec_id or False, not self.isnoupdate(data_node), noupdate=self.isnoupdate(data_node), mode=self.mode, context=rec_context )
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_model.py", line 1025, in _update
model_obj.write(cr, uid, [res_id], values, context=context)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/addons/base/ir/ir_ui_view.py", line 273, in write
context)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 250, in wrapper
return old_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 372, in old_api
result = method(recs, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/models.py", line 3787, in write
self._write(old_vals)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 248, in wrapper
return new_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 565, in new_api
result = method(self._model, cr, uid, self.ids, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/models.py", line 3959, in _write
recs._validate_fields(vals)
File "/media/disk2/workspace/odoo8_sss/openerp/api.py", line 248, in wrapper
return new_api(self, *args, **kwargs)
File "/media/disk2/workspace/odoo8_sss/openerp/models.py", line 1272, in _validate_fields
raise ValidationError('\n'.join(errors))
ParseError: "ValidateError
Field(s) `arch` failed against a constraint: Invalid view definition

Meer info over fout:
Veld test` bestaat niet

Fout context:
Weergave`MRP Product Produce`
[view_id: 1288, xml_id: SSS_po_project_task.view_mrp_product_produce_wizard_sss, model: mrp.product.produce, parent_id: 907]" while parsing /media/disk2/workspace/odoo8_sss/custom_artissan/SSS_po_project_task/views/mrp_view.xml:21, near
<record id="view_mrp_product_produce_wizard_sss" model="ir.ui.view">
<field name="name">MRP Product Produce</field>
<field name="model">mrp.product.produce</field>
<field name="inherit_id" ref="mrp.view_mrp_product_produce_wizard"/>
<field name="arch" type="xml">
<data>
<xpath expr="(//field[@name='product_id'])[2]" position="after">
<field name="test"/>
</xpath>
</data>
</field>
</record>
2016-01-21 11:06:14,370 6351 INFO db_20160107 werkzeug: 10.0.0.64 - - [21/Jan/2016 11:06:14] "POST /web/dataset/call_button HTTP/1.1" 200 -
2016-01-21 11:06:32,661 6351 INFO db_20160107 openerp.modules.loading: loading 1 modules…
2016-01-21 11:06:32,684 6351 INFO db_20160107 openerp.modules.loading: 1 modules loaded in 0.02s, 0 queries
2016-01-21 11:06:33,400 6351 DEBUG db_20160107 openerp.modules.loading: Updating graph with 107 more modules
2016-01-21 11:06:33,440 6351 INFO db_20160107 openerp.modules.loading: loading 108 modules…
2016-01-21 11:06:41,515 6351 INFO db_20160107 openerp.modules.module: module SSS_po_project_task: creating or updating database tables
2016-01-21 11:06:42,663 6351 INFO db_20160107 openerp.modules.loading: loading SSS_po_project_task/views/mrp_view.xml
2016-01-21 11:06:43,565 6351 ERROR db_20160107 openerp.addons.base.ir.ir_ui_view: Veld test` bestaat niet


Can anyone help me please????