ALV Grid - Very Strange Problem

I am facing a very strange problem in ALV Grid. Ours is a ECC5 system on SAP_APPL SAPKH50011 and SAP_BASIS SAPKB64016.
I have implemented the ALV grid in a screen using classes. This grid by default appears in display mode however it can be switched to change mode and back to display mode using a custom button on the ALV toolbar. When the user clicks the change button the grid appears in editable mode. During the back and forth switching of the ALV between Change/Display modes the ALV grid control is not destroyed however the toolbar, fieldcatalog and ALV contents are refreshed.
The data which is entered in an editable cell is validated using the data_changed event which has been implemented locally. If the validation fails an error message is raised using the message statement which is being issued correctly. Now when I correct the data and then click on another cell in the ALV grid the program is being aborted. Any clue why this is happening??

Please check this code
In the PBO of the screen set the field catalog and layout , i think this will help not to refresh the field catalog every time swtich between display and change mode
    set titlebar sy-dynnr with p_netwk.
    call method g_grid->set_frontend_fieldcatalog
      exporting
        it_fieldcatalog = gt_fieldcat[].
    call method g_grid->set_frontend_layout
      exporting
        is_layout = gs_layout.
    call method g_grid->refresh_table_display.
2. Regarding program abort, please paste the first page of system dump
a®

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