editing master data

Question: When I try to edit master data in BW , it doesn't allow me to save it .Is it because the data was already being used in the cubes ?Also if somebody edited master data please tell me how.Thanks in advance

Answer:
Why not change the Master data in the source system and reload it again. It will not take much time also.
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Answer:
Yes , that could be a solution but about the junk master data that already exists ( which needs to be cleaned up ).So the only solution seems to be deleting the cube data where this InfoObject is used & then delete the whole master data & re-load it .Thanks for your response anyway

Answer:
btw is your name RR Rao ?
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