Automatic posting of issued invoices requires the following settings:

• for debit posts - the customer account which will be used to record receivables from customers, irregardlessof item type and tax type;
• for credit posts -  inventory accounts and VAT accounts

Inventory accounts have to be defined for each item type separately. If the document type will be used to sell various item types, the accounts must be set up here in order to properly record the value of sold goods.

VAT accounts are defined according to the Sell-To parameter (in Subjects | Customer) 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.