Dear Srihari,
i advise you to run in any case all the reports in order to a line up always the situation and to better the performance of the analysis Pir report.
1) MD74 RM60RR20 Adjusting Requirements:This transaction consists of two parts.
2. MD75 RM60RR30 Delete Old Requirements Records.
3. MD76 RM60RR40 Delete History and Independent Requirements.
Daniele