T1-ovp overpayment

Any help on T1-OVP would be greatly appreciated as I have never done it before.
A client overcontributed his RRSP by 18,000. I notified him while preparing his tax return. He contacted his financial advisor who prepared T3012A and requested a refund from the RRSP issuer in part 4 of T3012A.
Two questions I have,
1- Does the client has to mail out T1-OVP and T3012A together?
2- Where do I enter the amount of withdrawal in T1-OVP?