How does the vendor posting groups determine the payables account in Business Central?
The vendor posting group, determines your payables account.
This is what happens in the video
The vendor posting group is defined in its own table.
Then you apply the vendor posting groups to the vendor, you create in the system, when you create new documents, typically purchase documents and the vendor posting group, will apply to those documents and they will also apply, when it creates journal lines from the document, when you post it.
But also when you create journal lines manually, for instance, purchase journals.
And when you post the documents in the journal, the vendor posting group will determine which accounts on the chart of accounts to post to, which are the payables account from the balance but also the discount accounts and the service charge account, in the income statement.