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SAP ABAP Listbox error in VRM_SET_VALUES

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Problems: The selected item in Listbox were automatically added on the Listbox whenever you re-execute the program. See image below. You know you code it correctly and still wondering how it acted differently? The problem is in the key field. It should be in CAPITAL LETTERS. Then, how about the blank entry in Listbox? Just add OBLIGATORY on the parameter statements. Happy Abaping!