Automatic posting of received invoices requires the following settings:

• for credit posts: the supplier account
• for debit posts:
  • inventory accounts which have to be defined for each item type separately. If the document type will be used to buy various item types, the accounts must be set up here in order to properly record the values of purchased goods.
  • VAT accounts which are defined according to the Purchase-From parameter (in Subjects | Supplier) and the Tax Type (in Items | General | Accounts).

For automatic posting of internal document types it is enough to specify inventory accounts, because internal documents do not involve any payables to suppliers and VAT.