Hello - I have a need for a 3rd party app or workflow in Odoo v14 to flag a vendor bill as ready for payment once a related customer invoice has been paid by the customer.

Here's an example:

    - A contractor bills me for time they spent working on a project for one of my customers.

    - I Invoice my customer for this work.

    - Once my customer pays the invoice, I will then pay my contractor.

    - I need a way to connect the vendor bill to the customer invoice on which I billed it, so that I can easily know when to pay the vendor bill.

In other applications this type of workflow is often called "Pay When Paid."  I know that I can bill expenses and PO items on sales orders in Odoo, but as far as I know that's where the workflow stops.  Wondering if there is a way to do this in native Odoo, or an existing 3rd party app that does it.

Thank you!