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I would guess your listbox has a defaultvalue. If so, remove it and assign the default in a WHEN-CREATE-RECORD-trigger.
There is no default value in the List Item Andreas Weiden
and it's values are depended on the previous Item selected.
The scenario is : There are 2 items as below
2- unit_code (Depended on the Item_id selected)
Once I choose the Item_id from LOV the UNITs related to the Item appear in unit_code
and not all items have the same units,So the elements in the unit_code must be cleared
every time i choose Item_id.
Appreciate your effort :)
Do you alteady have selected one or more records in that block. In this case, you can't clear the the list-item. You will have to use LoV's instead of listitems.