The purpose of the PostJournal is to transmit data necessary to create a journal entry from any sub ledger business application to a general ledger application.

Many applications in the enterprise environment create data that cause changes in the account balances of a general ledger application. Some components that have activity which will be reflected in a general ledger application are:

1. Benefits
2. Costing
3. Human Resources
4. Inventory Control
5. Manufacturing
6. Payroll
7. Production
8. Treasury

By no means is this a complete list of all the components that create activity which generate a journal entry.

Many tasks that occur within the enterprise applications cause the creation of a General Ledger journal entry.
Tasks relate directly to the Component. For example, the adjustment of inventory value is a task that occurs within the Inventory Control Component. Some of the tasks that would be catalysts for changes in a general ledger include:

1. Receiving Inventory
2. Issuing Inventory
3. Transferring Inventory
4. Adjusting Inventory Value
5. Adjusting Inventory Count
6. Calculating Material Variances
7. Calculating Labor Variances
8. Calculating Overhead Variances