SAP ERROR:SAP.Connector.RfcSystemException: Exception condition "CANNOT_UPDATE" raised.

See more:

.NET

SAP

Dear,
i am facing the following Error while m calling SAP BAPIE Z_BApi_Migo_Create from my .net application.every thing was working fine and i have made multiple transactions onit bt when the client add a new table with the bapi it gives the following error while bapi is perfactly working in SAP IDE.the Error is:

SAP ERROR:SAP.Connector.RfcSystemException: Exception condition "CANNOT_UPDATE" raised.
at SAP.Connector.SAPConnection.ThrowRfcException(RFC_ERROR_INFO_EX rfcerrInfo, Encoding encoding, String languangeCode)
at SAP.Connector.Rfc.RfcClient.RfcInvoke(SAPClient proxy, String method, Object[] methodParamsIn)
at SAP.Connector.SAPClient.SAPInvoke(String method, Object[] methodParamsIn)
at ClassSapProxyDllForMigo_Create.SapProxyDllForMigo_Create.Zbapi_Migo_Create(String Goodsmvt_Code, BAPI2017_GM_HEAD_01 Goodsmvt_Header, BAPI2017_GM_HEAD_RET& Goodsmvt_Headret, String& Matdocumentyear, String& Materialdocument, BAPI2017_GM_ITEM_CREATETable& Goodsmvt_Item, BAPI2017_GM_SERIALNUMBERTable& Goodsmvt_Serialnumber, SPE_BAPI2017_SERVICEPART_DATATable& Goodsmvt_Serv_Part_Data, BAPIRET2Table& Return0)
at Service.PostPODetails(String strScrnNo, String strDvcUsr, String strGM_Code, DataSet dsDetail) in d:\usman umer\FFBL\FFBL_WS\FFBL_WS\App_Code\Service.cs:line 2472

If any body have any solution abt this please help me to resolve this ERROr.
thanks in advance,
regards,
Usman umer
musmanumer1@gmail.com