Post Invoice errors
Invoices created as drafts that could not be posted.
Open Post Invoice Error
The link opens the screen directly in the Integration Dashboard.
Create versus post
Creating produces a draft invoice; posting makes it an official invoice with a number and accounting entries. A draft invoice has no effect on your books.
Common causes
A locked accounting period.
Numbering sequence not configured on the journal.
A missing account on one of the lines.
Unbalanced entries caused by a tax or rounding issue.
The invoice exists as a draft
You can open it in Odoo and try posting it by hand. Odoo's message on a manual attempt is often clearer and points at the missing field.
Retry once the cause is fixed
Fix the cause first, in Odoo or in your settings, then press Retry on the row. Retrying without fixing the cause fails with the same message.