新建一个类，继承自动态表单抽象插件类AbstractBillPlugIn，重写PreOpenForm。

/// 
    /// 销售订单 单据维护界面插件    /// 
    public class SaleOrderEdit : AbstractBillPlugIn    {        //        // Summary:        //     动态表单打开前事件        //        // Parameters:        //   e:        //     动态表单打开前事件参数        public override void PreOpenForm(BOS.Core.DynamicForm.PlugIn.Args.PreOpenFormEventArgs e)        {            if (e.OpenParameter.Status == OperationStatus.ADDNEW)            {                long orgId = e.Context.CurrentOrganizationInfo.ID;                Object objEqualSaler = CommonServiceHelper.GetSystemProfile(e.Context, orgId, Kingdee.K3.Core.SCM.SCMFormIdConst.SAL_SystemParameter, SCMConst.PARAM_SELLEREQUALCREATOR, false);                para_EqualSaler = objEqualSaler == null ? false : Convert.ToBoolean(objEqualSaler);                if (para_EqualSaler)                {                    long sellerId = SaleServiceHelper.GetSellerIdFromUserId(e.Context, orgId, e.Context.UserId);                    if (sellerId == 0)                    {                        e.Cancel = true;                        e.CancelMessage = Kingdee.BOS.Resource.ResManager.LoadKDString("当前用户不是销售员，不能录入订单！", "004019030003349", Kingdee.BOS.Resource.SubSystemType.SCM);                    }                }            }        }    }