Dear All, I am trying to create a ALV Tree using Class cl_gui_alv_tree. The Report Shows the Output with the first Node but when i try to expand it is dumping with a runtime error GETWA_NOT_ASSIGNED in class CL_ALV_TREE_BASE and method SET_ITEMS_FOR_COLUMN. The Reason being the data which was copied in the initial node display to mt_outtab is getting refreshed.
Can any one of you help me the reason for the table getting refreshed. Do i need to pass any data.
I am doing the following steps.
1. Create Container,
2. Create Tree Class object
3. Generate the Field Catalog.
4. Set table for first display " With empty internal table
5. Generate the Hierarchy
6. Call the Method Frontend Update.
Let me know if i had missed any steps in the process.