For each period, you can see whether an invoice has already been created. If an invoice has been created for the current period, this check box will be selected automatically. The number and creation date of this invoice are displayed in the Invoice number and Invoice date fields.

For each period, you can see whether an invoice has already been created. If an invoice has been created for the current period, and the current period is the final period (the Last period check box on the General tab is selected), the 'Current' check box is selected automatically. The number and creation date of this final invoice are displayed in the Invoice number and Invoice date fields.