How validations should work by sequence ?

[maisim]

Module

account_move_tier_validation

Describe the bug

Validation don't wait the validation of the previous ones to be asked
How validations should work by sequence ?

To Reproduce

Affected versions:

Steps to reproduce the behavior:

1. Create a first tier validation on move with a sequence number (30) and check approve_by_sequence
2. Create a second tier validation on move with a greater number (31) and check approve_by_sequence
3. Go to an invoice then ask for validation

Mitchell is asked to carry out the 2nd validation while Marc has not yet carried out the first :

Expected behavior

Validations should not be requested until previous ones have been validated

Additional context
Tested on odoo 12 (account_invoice_tier_validation), odoo 14 (account_move_tier_validation)