sales : Product invoices

A product invoice is an invoice whose rows usually refer to a product (which indirectly maps to a ledger account according to configurable rules). This is in contrast to account invoices whose rows directly point to ledger accounts and don't need any products.

Snippets in this document are tested on the lino_book.projects.pierre demo project.

>>> from lino import startup
>>> startup('lino_book.projects.pierre.settings.doctests')
>>> from lino.api.doctest import *
>>> ses = rt.login('robin')

The plugin

Lino implements product invoices in the lino_xl.lib.sales plugin. The internal codename "sales" is for historical reasons, you might generate product invoices for other trade types as well.

The plugin needs and automatically installs the lino_xl.lib.products plugin.

It also needs and installs lino_xl.lib.vat (and not lino_xl.lib.vatless). Which means that if you want product invoices, you cannot not also install the VAT framework. If the site owner is not subject to VAT, you might add lino_xl.lib.bevats which hides most of the VAT functionality.

>>> dd.plugins.sales.needs_plugins
['lino.modlib.memo', 'lino_xl.lib.products', 'lino_xl.lib.vat']

This plugin may be combined with the lino_xl.lib.invoicing plugin which adds automatic generation of such product invoices.

Product invoices

A product invoice is a legal document which describes that something (the invoice items) has been sold to a given business partner (called the customer). The partner can be either a private person or an organization.

class VatProductInvoice

The Django model representing a product invoice.

Inherits from lino_xl.lib.ledger.Voucher.

Virtual fields:

balance_before

The balance of previous payments or debts. On a printed invoice, this amount should be mentioned and added to the invoice's amount in order to get the total amount to pay.

balance_to_pay

The balance of all movements matching this invoice.

Methods:

get_print_items(self, ar):

For usage in an appy template:

do text
from table(obj.get_print_items(ar))
class InvoiceItem

The Django model representing an item of a product invoice.

class InvoiceDetail

The Lino layout representing the detail view of a product invoice.

class Invoices
class InvoicesByJournal
Shows all invoices of a given journal (whose `voucher_type` must be
:class:`VatProductInvoice`)
class DueInvoices

Shows all due product invoices.

class ProductDocItem

Mixin for voucher items which potentially refer to a product.

product

The product that is being sold or purchased.

description

A multi-line rich text to be printed in the resulting printable document.

discount
class ItemsByInvoicePrint

The table used to render items in a printable document.

description_print

TODO: write more about it.

class ItemsByInvoicePrintNoQtyColumn

Alternative column layout to be used when printing an invoice.

class SalesDocument

Common base class for lino_xl.lib.orders.Order and VatProductInvoice.

Inherits from lino_xl.lib.vat.mixins.VatDocument and ino_xl.lib.excerpts.mixinsCertifiable.

Subclasses must either add themselves a date field (as does Order) or inherit it from Voucher (as does VatProductInvoice).

Note that this class sets edit_totals to False.

print_items_table = None

The table (column layout) to use in the printed document.

ItemsByInvoicePrint ItemsByInvoicePrintNoQtyColumn

Paper types

class PaperType

Describes a paper type (document template) to be used when printing an invoice.

A sample use case is to differentiate between invoices to get printed either on a company letterpaper for expedition via paper mail or into an email-friendly pdf file.

Inherits from lino.utils.mldbc.mixins.BabelNamed.

templates_group = 'sales/VatProductInvoice'

A class attribute.

template

Trade types

The plugin updates your lino_xl.lib.ledger.TradeTypes.sales, causing two additional database fields to be injected to lino_xl.lib.products.Product.

The first injected field is the sales price of a product:

>>> translation.activate('en')
>>> print(ledger.TradeTypes.sales.price_field_name)
sales_price
>>> print(ledger.TradeTypes.sales.price_field_label)
Sales price
>>> products.Product._meta.get_field('sales_price')
<lino.core.fields.PriceField: sales_price>

The other injected field is the sales base account of a product:

>>> print(ledger.TradeTypes.sales.base_account_field_name)
sales_account
>>> print(ledger.TradeTypes.sales.base_account_field_label)
Sales account
>>> products.Product._meta.get_field('sales_account')
<django.db.models.fields.related.ForeignKey: sales_account>

The sales journal

>>> rt.show('ledger.Journals', column_names="ref name trade_type")
=========== ============================ ============================ =====================
 Reference   Designation                  Designation (en)             Trade type
----------- ---------------------------- ---------------------------- ---------------------
 SLS         Factures vente               Sales invoices               Sales
 SLC         Notes de crédit vente        Sales credit notes           Sales
 PRC         Factures achat               Purchase invoices            Purchases
 PMO         Ordre de paiement Bestbank   Bestbank Payment Orders      Bank payment orders
 CSH         Livre de caisse              Cash book
 BNK         Bestbank                     Bestbank
 MSC         Opérations diverses          Miscellaneous transactions
 PRE         Preliminary transactions     Preliminary transactions
 SAL         Fiches de paie               Paychecks
=========== ============================ ============================ =====================
>>> jnl = rt.models.ledger.Journal.get_by_ref("SLS")
>>> rt.show('sales.InvoicesByJournal', jnl)
... 
===================== ============ ============ =================================== =============== ============== ================
 No.                   Entry date   Due date     Partner                             Total to pay    Subject line   Workflow
--------------------- ------------ ------------ ----------------------------------- --------------- -------------- ----------------
 15/2017               12/03/2017   18/03/2017   da Vinci David                      1 110,16                       **Registered**
 14/2017               11/03/2017   17/03/2017   da Vinci David                      535,00                         **Registered**
 13/2017               10/03/2017   09/03/2017   di Rupo Didier                      280,00                         **Registered**
 12/2017               09/03/2017   07/04/2017   Radermacher Jean                    679,81                         **Registered**
 11/2017               08/03/2017   31/03/2017   Radermacher Inge                    2 039,82                       **Registered**
 10/2017               07/03/2017   04/06/2017   Radermacher Hedi                    2 999,85                       **Registered**
 9/2017                14/02/2017   14/04/2017   Radermacher Hans                    494,80                         **Registered**
 ...
 6/2016                07/02/2016   06/05/2016   Garage Mergelsberg                  1 110,16                       **Registered**
 5/2016                11/01/2016   10/03/2016   Bäckerei Schmitz                    535,00                         **Registered**
 4/2016                10/01/2016   08/02/2016   Bäckerei Mießen                     280,00                         **Registered**
 3/2016                09/01/2016   18/01/2016   Bäckerei Ausdemwald                 679,81                         **Registered**
 2/2016                08/01/2016   14/01/2016   Rumma & Ko OÜ                       2 039,82                       **Registered**
 1/2016                07/01/2016   06/01/2016   Bestbank                            2 999,85                       **Registered**
 **Total (72 rows)**                                                                 **82 597,39**
===================== ============ ============ =================================== =============== ============== ================
>>> mt = contenttypes.ContentType.objects.get_for_model(sales.VatProductInvoice).id
>>> obj = sales.VatProductInvoice.objects.get(journal__ref="SLS", number=20)
>>> url = '/api/sales/InvoicesByJournal/{0}'.format(obj.id)
>>> url += '?mt={0}&mk={1}&an=detail&fmt=json'.format(mt, obj.journal.id)
>>> test_client.force_login(rt.login('robin').user)
>>> res = test_client.get(url, REMOTE_USER='robin')
>>> # res.content
>>> r = check_json_result(res, "navinfo data disable_delete id param_values title")
>>> print(r['title']) 
<a ...>Sales invoices (SLS)</a> » SLS 20/2016

IllegalText: The <text:section> element does not allow text

The following reproduces a situation which caused above error until 2015-11-11.

TODO: it is currently disabled for different reasons: leaves dangling temporary directories, does not reproduce the problem (probably because we must clear the cache).

>> obj = rt.models.sales.VatProductInvoice.objects.all()[0] >> obj VatProductInvoice #1 ('SLS#1') >> from lino.modlib.appypod.appy_renderer import AppyRenderer >> tplfile = rt.find_config_file('sales/VatProductInvoice/Default.odt') >> context = dict() >> outfile = "tmp.odt" >> renderer = AppyRenderer(ses, tplfile, context, outfile) >> ar = rt.models.sales.ItemsByInvoicePrint.request(obj) >> print(renderer.insert_table(ar)) #doctest: +ELLIPSIS <table:table ...</table:table-rows></table:table>

>> item = obj.items.all()[0] >> item.description = """ ... <p>intro:</p><ol><li>first</li><li>second</li></ol> ... <p></p> ... """ >> item.save() >> print(renderer.insert_table(ar)) #doctest: +ELLIPSIS Traceback (most recent call last): ... IllegalText: The <text:section> element does not allow text

The language of an invoice

The language of an invoice not necessary that of the user who enters the invoice. It is either the partner's language or (if this is empty) the Site's get_default_language.