A Journal represents a book of original entry from traditional manual accounting. In Tryton it allows Account Moves of the same class to be grouped together. Every account move gets associated with a journal, and the journal defines what sequence is then used to number the account move.
Among the journal’s properties is a type. This limits where the journal can be used.
For each Company, a Journal Period links together the concepts of a Journal, and an accounting Period. Each journal period is created automatically when the first Account Move is created in the journal and period. It provides a way of partially closing a period one journal at a time.