How to set a lookup value using Xrm.utility for an existing record.

Hi all,

i am having a problem in setting the lookup field value by using XRM.Utility.

I am unable to set the lookup of an existing record.

How to do it.

here is my code:

var parameters = {
            mcg_clientid: clientId,
            mcg_clientidname: clientname
        };

        Xrm.Utility.openEntityForm("new_entity",recordId , parameters);

here recordId is already existing record id.