Editable ALV table

Dear Friends

I've got a problem!!

I've created an ALV table with REUSE_ALV_GRID_DISPLAY. Now I want that it is editable.

This not a problem. The problem ist my data table is dynamically that means this is the call --> PERFORM start_alv_2 TABLES <gt_alv>.

The problem is now if I insert any values in the ALV and than loop after that trough my table the values which I

type in aren't in the table???

Do someone have experience with this?

Thanks a lot for your help.

Simon