Tryton application platform - account tax cash module

 Tryton is a high-level general purpose application platform. It is the base
 of a complete business solution as well as a comprehensive health and hospital
 information system (GNUHealth).
 .
 The account_tax_cash module allows to make tax report on cash basis.
 .
 The tax groups reported on cash basis are defined on the *Fiscal Year* and
 *Period*. They can also be defined on the supplier invoices which get the
 default values from the *Party*.
 .
 When a payment lines is added to an invoice, the tax lines for the proportional
 amount are set on the corresponding tax code for the current period.
 If a payment line is removed from an invoice, the reverse operation is applied.
 .
 When closing a *Period*, a warning is raised if there are still
 receivable/payable lines not reconciled or linked to an invoice.
 .
 Hint:
 The invoice template may need to be adapated to include a legal notice when
 tax on cash basis is used. It can be tested with the *on_cash_basis*
 property of the *Invoice Tax*.