Select the default category that is entered on the accounting distribution lines for the project. When you change the category, ...

Select the default category that is entered on the accounting distribution lines for the project. When you change the category, if category relations are specified in the Ledger posting setup page, the Main account field is updated with the account that is associated with the new category. If you have not yet viewed the accounting distribution for the line by opening the Accounting distributions page, changing the category also changes the ledger account in the Accounting distributions page. To prevent the account from being changed when you change the category, clear the Allow the ledger account number to be edited option in the Accounts receivable parameters page. This field is available only if the Display project-related fields on free text invoices option is selected in the Accounts receivable parameters page. If the Public Sector configuration key is selected, and the category is associated with the selected billing code, you can prevent this field from being modified. In the Billing codes page, select the billing code, and then clear the Allow changes option next to the category.