I can't create any sub-task

Question

When I try to create a sub-task I receive the following error:

Error while validating constraint
Expected singleton: project.task(3473, 3463)

I use Odoo 11 Community Edition.

Niyas Raphy (Walnut Software Solutions) · Answer

Hi,
I believe version 11, doesn't provide sub task option by default(correct me if am wrong), so most probably the error will be coming from the custom codes.
So you have to check your log and update the code such a way that. code can handle multiple records.
See:   Singleton Error In Odoo [1]
Thanks

[1] https://www.youtube.com/watch?v=Rv44nFVn_5U

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi
Maybe it comes in your customized code, the project task has different records in the same project that's why it happened.
you can refer to the blog:  https://www.cybrosys.com/blog/how-to-handle-singleton-error-in-odoo-15 [1]  it will help to reduce the single-ton issue

Hope it helps

[1] https://www.cybrosys.com/blog/how-to-handle-singleton-error-in-odoo-15

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