Editable ALV-No change in internal table

Hello Experts,

I have an ALV output, in which I have a column as editable. I have generated the output using 'REUSE_ALV_GRID_DISPLAY'. I got to know that after changing the editable cell's value, if we double click the cell or if operate with any PF-status components, the value will automatically get changed in internal table also. For double click I am getting the expected result. But If I click a button the value doesn't get changed in internal table. Is there any other change I have to do for this. If I have checkbox in ALV will it be rectified. But my requirement is when I click the button only It has to be modified in the database table.

Thanks and regards,

Venkat.