E filing intermediary (eri)

I was just going through the My Accounts section in the e-filing portal and I was shocked to see that an ERI was registered as recently as 04/02/2013 in my account. I can see a provision to add CA but I do not see any provision to add an ERI. I can only see a provision to disengage one. What worries me is has the department themselves designated an ERI for me. If not, can I remove the same. What are the repercussions of removing an ERI and does it affect my tax filing for already filed returns. My AY 2012-13 is not yet processed and still in the ITR-V receipt stage. I do not want to do anything that may affect that as I filed these returns and sent the ITR-V myself and not through any intermediary.