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Validating some operations is a common need across different areas in a company and sometimes it also involves several people and stages in the process. With this module you will be able to define your custom validation workflows for any Odoo document.
This module does not provide a functionality by itself but an abstract model to implement a validation process based on tiers on other models (e.g. purchase orders, sales orders, budgets, expenses...).
Note: To be able to use this module in a new model you will need some development.
See purchase_tier_validation as an example of implementation.
Additionally, if your state field is a (stored) computed field, you need to
set _tier_validation_state_field_is_computed to True in your model Python
file, and you will want to add the dependent fields of the compute method
in _get_after_validation_exceptions and _get_under_validation_exceptions.