Wow It works, but there is a new error message shows up

"odoo.exceptions.ValidationError: You must specify one signer for each role of your sign template"

After applying you solution this is my code

# Create the sign send request
send_request_data = {
"template_id": int(payload.get("template_id")),
"subject": "test Subject",
"filename": "test.pdf",
}

send_request = env["sign.send.request"].create(send_request_data)

signer_data = [{
"role_id": 1, # Assuming this is a required role ID in your case
"partner_id": int(payload.get("partner_id")),
"mail_sent_order": 1,
"sign_send_request_id": send_request.id
}]

signer = env["sign.send.request.signer"].create(signer_data)
send_request.send_request()

What could be the problem in this?

Hello,

In Odoo, there's a method called _check_signers_roles_validity, which is triggered when the send_request() method is called. This method verifies that each signing role defined in a sign template has exactly one corresponding signer assigned when a sign request is created. If this condition is not met, a ValidationError is raised.

Example Scenarios:
- Valid Case:
The template includes 3 roles (Manager, HR, Employee).
The sign request has 3 signers, each correctly assigned to one of these roles.

- Invalid Case 1:
The template has 3 roles, but the sign request only includes 2 signers → Error raised.

- Invalid Case 2:
The template has no roles defined, but the sign request does not include at least one signer with the default role → Error raised.

I hope this will helpfull for you.

Thanks!