供应链大神--关于指定供应商的问题。加急！！！

DynamicFormShowParameter param = new DynamicFormShowParameter();
param.FormId = "PUR_Req_AllocSupplier";
this.View.ShowForm(param, delegate(FormResult _Result)
{
DynamicObject _objReturn = _Result.ReturnData as DynamicObject;
if (_objReturn == null) return;
if (PurchaseServiceHelper.UpdateEntrySupplier(this.Context, entryIDList, _objReturn))
{
this.View.ShowMessage(ResManager.LoadKDString("指定供应商成功", "004015030002782", SubSystemType.SCM, new object[0]), MessageBoxType.Notice);
}
else
{
this.View.ShowMessage(ResManager.LoadKDString("指定供应商失败", "004015030002785", SubSystemType.SCM, new object[0]), MessageBoxType.Notice);
}
});

通过这样去弹出供应商的界面，但是老是提示

请问大神，是不是还有什么参数未设置？