Hi Jaya,
I believe the issue you're hitting is:
DE36631 When two attachments are deleted on the same subpage, you get redirected to the CA PPM Home page
This is affecting 15.2 and will be fixed in 15.4. Affects SSL enabled environments and you will get warning message in logs:
WARN 2017-07-27 18:12:30,779 [http-bio-14001-exec-182889] web.WebActionController (clarity:admin:13639903__7D48BF78-E3B2-4C60-A191-C6BDA89D04C9odf.removeObjectDocument) Detected potentially malicious redirect URL when expecting redirect action id:
Please check it out. If you need a patch for it - please raise a case with us in Support. Otherwise the fix is coming in CA PPM 15.4. due in spring.
Hope this helps -Nika