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Answer Posted / naresh
LAYERS OF DATA DESCRIPTION IN R/3 ARE 3 TYPES.
1. EXTERNAL LAYER.
2. ABAP/4 LAYER.
3. DATABASE LAYER.
EXTERNAL LAYER:- FOR USER PURPOSE FOR INTERACTING DATA.
ABAP/4 LAYER:- DESCRIBES THE DATA FORMATS USED BY THE ABAP/4
PROCESSOR.
DATABASE LAYER:- DESCRIBES THE DATA FORMATS USED IN THE
DATABASE.
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