I have done RCM2 analysis, however the send for approval is not working after change the status into draft.
Analysis Approval can be tricky because it differs in many ways from Cost Dependent object (Work Order, Purchase order, etc) approvals. Perform the 4 following steps, using the referenced instructions find in the links to get your Analysis Approval process up and running.
1. Check that the site settings for approvals is set-up to allow for Strategy Development Analysis approval, see linked instructions "Strategy Development Analysis Approval Setup rev 2".2. Understand the difference in setting up Analysis Approval Route from a Cost Dependent Object Approval Route, see linked instructions "Chain Approval versus Voting Approval".3. Check that the Analysis Status is "Analysis Complete", see linked instructions "Update Analysis Status to Send for Approval".4.Upon making a change to an Approval Route, existing approval requests assigned to the updated route need to be Redrafted and then "Sent for Approval" again for the new Approval Route's Rules will apply.