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1. Go to Invoicing \> Configuration \> Contracts \> Formulas
(quantity).
2. 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.
![](images/formula_form.png)