The above program is loaded when the Allocation tab is clicked from the Invoice Details screen.
Please refer to the Grid Views for how to use the Invoice Allocation grid view.
The gird shows all the individual transactions that were allocated for the selected invoice. If no transactions were allocated (see the 'No Cost Allocation' option on Cost Allocation) then nothing will be shown.
If costs have been allocated these will be shown and will not be available for editing or subsequent invoicing.