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ALV with dropdown in column and other questions


I created an editable alv with configuration model via external context mapping.

now I have a column which contains strings and my aim is to show this whole column as a dropdownlist. the possible values of this dropdown are fetched in a database table at runtime and each cell in this column got its own selected value in this dropdownlist.

changes of the selected values should be written in the database table in a later step.

1. what changes do I have to do?

should I remove my external mapping concerning the alv and use the setData method? or what is the easiest way to get my dropdownlist in this column instead of normal text (string) ?

2. should I choose dropdownbykey or by index?

I suppose I have to change the context when changing the selected value in the dropdownlist and the read out the changed context element and update my database table?

3. how could I access rows (= tuples) in an alv?

4. how can I avoid that a row could be deleted, inserted or added with the normal functions of the alv?

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