If this is simply a judgment and not a lien against assets you owned on the date your bankruptcy case is filed, then someone (you don't say who) needs a bit of an education. Who is it that is not "allowing" you to buy a home? If it a title company? Without knowing what their specific concern is, it's hard to tell you how to proceed. I doubt you'll be able to get a satisfaction of judgment filed by the creditor, although of course you can try to get that, but it is unnecessary.
If you received a discharge and you owed this debt prior to the chapter 7 case being filed, and no assets were distributed by the Trustee in your case, then the debt was discharged (unless the civil judgment was of a type not dischargeable, such as a domestic support obligation or student loan). You probably just need to have an attorney write a letter explaining how this works to the title company or whomever is having the problem on this, but without more details, I can't tell you who that is or what their problem is.
Mark J. Markus, Attorney at Law
Handling exclusively bankruptcy law cases in California since 1991.
If the civil court judgment is for a debt which you included in your bankruptcy petition, the debt has been discharged by the bankruptcy court unless it falls into a special catagory like child support or some other type of debt which is not dischargable in bankruptcy. The bankruptcy court order discharging your debts should be the only document you need to prove you don't owe the debt. (i.e. you have already been released of your liability). If the debt is for child support or some other debt which has not been discharged in your bankruptcy then that liability remains. I suggest you show the bankruptcy court order discharging your debts to the person who is asking you to prove your release of liability.
Make sure the Plaintiff did not record an Abstract of Judgment at The County Recorder's Office. If they did, you need to re-open your ch7 and file a Motion to Avoid Judicial Lien if possible.
Mail a certified letter with a copy of your Discharge Order to the Reporting Agency that is showing the judgment as not satisfied. Ask them to fix it and sue them if they don't fix it.