so odoo removed a feature that was being used by you guys and now you had to implement it your own way?

i now really hate the fact that they are removing features. cause im searching for official documents on the workflow for v13 but could only find it for v10.

So they deprecated the exec_workflow functionality since Odoo V10 I believe, it was still available back then. In Odoo V11 or V12 they removed it completely.

These two lines:

models.exec_workflow(db, uid, password, 'purchase.order', 'bid_received', PO_id)

models.exec_workflow(db, uid, password, 'purchase.order', 'purchase_confirm', PO_id)

where to confirm purchase orders using workflow, now that workflows are removed you are able to do the equivalent process by the following line:

models.execute_kw(db, uid, password, 'purchase.order', 'button_confirm', [po_id])

"button_confirm" is the name of the button you would be pressing to confirm a purchase order on the frontend of Odoo.

So if I am correct it is still possible to trigger these 'workflows' but now using the actual buttons you see in the frontend.