To delete recovery points from the target side you must first delete the replication relationship between the source and the target. Deleting the replication relationship is different from deleting recovery points. You can delete the replication relationship without deleting any data.
IMPORTANT: Please note that you should not delete single incremental recovery points. Deleting a single incremental in the middle of a chain will cause the chain to be unusable. Only delete older base images and the recoverypoints associated with that base image.