Bug description
---------------
`account.analytic.contract.line` inherits
`account.analytic.invoice.line`
`account.analytic.invoice.line` defines field `analytic_account_id`:
- comodel='account.analytic.account'
`account.analytic.contract.line` redefines field `analytic_account_id`:
- comodel='account.analytic.contract'
On attempt to extend `account.analytic.invoice.line` model adding
field that depends on `analytic_account_id.date_start`
Odoo fails to update, because it adds this field to
`account.analytic.contract.line` through inheritance,
and `account.analytic.contract` model have no this field.
What is done
------------
Change inheritance order:
- `account.analytic.invoice.line` inherits
`account.analytic.contract.line`
- no file renames at this stage (this wil be done in next commit)
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Variable quantity in contract recurrent invoicing
=================================================
With this module, you will be able to define in recurring contracts some
lines with variable quantity according a provided formula.
Configuration
=============
* Go to Sales > Configuration > Contracts > Formulas (quantity).
* Define any formula based on Python code that stores at some moment a
float/integer value of the quantity to invoice in the variable 'result'.
You can use these variables to compute your formula:
* *env*: Environment variable for getting other models.
* *context*: Current context dictionary.
* *user*: Current user.
* *line*: Contract recurring invoice line that triggers this formula.
* *contract*: Contract whose line belongs to.
* *invoice*: Invoice (header) being created.
Usage
=====
To use this module, you need to:
* Go to Sales -> Contracts and select or create a new contract.
* Check *Generate recurring invoices automatically*.
* Add a new recurring invoicing line.
* Select "Variable quantity" in column "Qty. type".
* Select one of the possible formulas to use (previously created).
