axapta - 是否可以为2个formDataSourceStr创建1个事件处理程序？

问题的改变。如何在purchcreateorder中覆盖正确修改的字段？现在它可以编译，但是值仍然没有以我的形式显示。

[ExtensionOf(formdatasourcestr(PurchCreateOrder, PurchTable))]
final class PurchCreateOrderGetDefAdress_Extension
{

[DataField]
class OrderAccount
{
    void modified()
    {

        element.orderAccountModified();
        InventLocation                              inventlocation;
        UserInfoSz                                  usrsz;
        PurchTable purchtable;
        FormDataSource ds;
        FormDataObject df =any2Object(this) as FormDataObject;

        next Modified();

        ds = df.datasource();
        PurchTable = Ds.cursor();

        select InventLocation where InventLocation.inventsiteid == usrsz.InventSiteId && inventlocation.DefaultShipMaintenanceLoc == 'out';

        purchtabke.orderaccount = '11111111111111111111';
        purchtable.inventsiteid = 'ILA-LOG-01';// InventLocation.inventsiteid;
        purchtable.inventlocationid = InventLocation.InventLocationId;
        purchtable.DeliveryName = 'sasasasa';
        //purchTable_ds.refresh();

    }
    }