How to Find Alies Data Source In sap B1 SDK

oItem = oForm.Items.Item("3");

                oNewItem = oForm.Items.Add("edtxt", SAPbouiCOM.BoFormItemTypes.it_EXTEDIT);

                oNewItem.Left = oItem.Left - 110;

                oNewItem.Width = 1000;

                oNewItem.Top = oItem.Top+20;

                oNewItem.Height = 200;

                oNewItem.FromPane = 32;

                oNewItem.ToPane = 32;

                oEdtxt = (SAPbouiCOM.EditText)oNewItem.Specific;

               oEdtxt.DataBind.SetBound(true, "OPOR", "U_CMNT");

                oNewItem.Enabled = true;

other CODE For SYSTEM TABLE

SAPbobsCOM.UserFieldsMD FieldsMD;

                FieldsMD = (SAPbobsCOM.UserFieldsMD)oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oUserFields);

                if(!ClsDIGeneric.DoesUserFieldExist(oCompany,"OPOR","CMNT"))

                {

                    FieldsMD.TableName = "OPOR";

                    ClsDIGeneric.AddUserField(oCompany, FieldsMD, "CMNT", "Commnt", SAPbobsCOM.BoFieldTypes.db_Alpha, SAPbobsCOM.BoFldSubTypes.st_None, 200, "", SAPbobsCOM.BoYesNoEnum.tNO);

                }

                System.Runtime.InteropServices.Marshal.ReleaseComObject(FieldsMD);

                ClsSBOAddOn.SBOCompany.GetLastError(out ErrorCode, out ErrMessage);

Please Help Me

Regards

Mohammad Asharaf