SAP ABAP A parameter with no record available

When we generate a classical report, parameters were used at the selection screen. If there is no record for the particular parameter, then a user has to call it up, but it says the specified record is not available. How can we fix this?

Look at the function modules in groups SPO1, SPO2, SPO3 and SPO4. You can call the appropriate one in the END-OF-SELECTION event or the AT SELECTION-SCREEN event. However, if much data is selected you should use the former rather than the latter – conceptually it is wrong to select volumes of data in the AT SELECTION-SCREEN event.