Getting the error while using bapi 'BAPI_PROJECTDEF_UPDATE'.

Hi,

All

To fulfill a requirement of project definition update in PS module, I have been trying with bapi 'BAPI_PROJECTDEF_UPDATE' , but I am getting the error like 'The external key is not compatible with the internal key'.

Following are the details of my source code:

CALL FUNCTION 'BAPI_PS_INITIALIZATION'

           .

   data: ls_def_strucure LIKE BAPI_PROJECT_DEFINITION,

       ls_def_update LIKE BAPI_PROJECT_DEFINITION_UP,

       ls_error like bapireturn1.

ls_def_strucure-PROJECT_DEFINITION = '11011'.

ls_def_strucure-DESCRIPTION = 'Indian Metro Updated by BAPI'.

ls_def_update-DESCRIPTION = 'X'.

CALL FUNCTION 'BAPI_PROJECTDEF_UPDATE'

   EXPORTING

     currentexternalproje          = '11011'       " Project Definition

     currentinternalproje          = '11011'

     project_definition_stru       = ls_def_strucure

     project_definition_up         = ls_def_update

  IMPORTING

    RETURN                        = ls_error

* TABLES

*   E_MESSAGE_TABLE               =

           .

CALL FUNCTION 'BAPI_PS_PRECOMMIT'.

CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'.

           .

I have tried with 'BAPI_PROJECT_MAINTAIN' ,but there I am not getting any idea to usage of this bapi.

please help me if you have any solution for this problem.

Thanks in advanced.