Maybe the Change Request, which cannot be approved/rejected by you, is assigned to another IBASE-component or is created with another subject (e.g. development correction instead of urgent correction).
You need corresponding authorization roles for the project (created for the Ibase component) and the different subjects.
Did you start transaction SU53 directly after getting the message concerning missing authorizations / directly after approving or rejecting the Change Request?
You will get more details about the authorization objects, which don't fit.
Have you considered that either you are not set up as a BP for this change request to do the approval or you have not been tied to the project that has this change request?
Check if there are no authorization issues - transaction st01 - start the trace and then perform your action. check if there are rc <> 0.
Another idea might be the two-man-rule in the customizing. Check if your bp is stored in the message. Remove all of them, save and then try to execute the action again.
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