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How to create input text of the node in AVL tree

Hi experts,

I create a simple AVL tree to display the sales order items, just two classes for one relationship. Like the left part on the screen in this program "DEMO_ABAP_OBJECTS_CONTROLS".

I want to let the node of the second class be maintained serial no., somthing like input field behind the node or double click the node, then show up the input field on another space on the same screen.

And there is a button on screen, I can do some check for the text of input field when pressing the button. If the input data is wrong , then show up the error message.

I have searched BCALV* in SE38, but i don't see anything helpful.

Plz give me some advice, thanks a lot!!



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