having a problem with an add in using AddHook(EdmCmdType.EdmCmd_CardInput)

when triggered from a combobox on folder datacard it calls the OnCmd function, on _vars.SetVar("Project Description", "", "xxxxxxxxxxxxxxxxx"); it loops and re-runs the OnCmd function and quite obviously bombs out (debug).

created another add in doing the same thing but that add in works.

void EdmLib.IEdmAddIn5.OnCmd(ref EdmCmd poCmd, ref System.Array ppoData)

{

    IEdmVault5 edmVault = poCmd.mpoVault as IEdmVault5;

    IEdmEnumeratorVariable5 _vars = (IEdmEnumeratorVariable5)poCmd.mpoExtra;

    object DescVal = null;

    string DescValStr = string.Empty;

    try

    {

        if (poCmd.meCmdType == EdmCmdType.EdmCmd_CardInput)

        {

            switch (poCmd.mbsComment)

            {

                case "Project Number":

                    _vars.GetVar("Project Number", "", out DescVal);

                    DescValStr = DescVal.ToString().Trim();

                    if (!string.IsNullOrWhiteSpace(DescValStr))

                    {

                        _vars.SetVar("Project Description", "", "xxxxxxxxxxxxxxxxx");

                    }

                    break;

                default:

                    break;

            }

        }

    }

    catch (COMException exp)

    {

        string errorName, errorDesc;

        edmVault.GetErrorString(exp.ErrorCode, out errorName, out errorDesc);

        edmVault.MsgBox(0, errorDesc, EdmMBoxType.EdmMbt_OKOnly, errorName);

    }

}