"Individual check for creating the object WBS Element A002--141 required." In BAPI_BUS2054_CREATE_MULTI

Hello experts,

I have a requirement to create WBS element using BAPI  BAPI_BUS2054_CREATE_MULTI.But while doing so I am getting this error Individual check for creating the object WBS Element A002--141 required.Can anyone please help me resolve it.

Below is the code that I am using.

loop at it_proj into wa_proj.

           wa_BAPI_TE_WBS_ELEMENT-WBS_ELEMENT    = wa_wbs-WBS_ELEMENT.

           GT_EXTENSION_IN-STRUCTURE = 'BAPI_TE_WBS_ELEMENT'.

*          GT_EXTENSION_IN-VALUEPART1 = wa_BAPI_TE_WBS_ELEMENT-zzfund.

           GT_EXTENSION_IN-valuepart1 = wa_proj-zzfund.

           GT_EXTENSION_IN-valuepart2 = wa_proj-zzgrant_nbr.

           APPEND GT_EXTENSION_IN.

         ENDLOOP.

         CALL FUNCTION 'BAPI_PS_INITIALIZATION'.

         CLEAR gt_return[].

         CALL FUNCTION 'BAPI_BUS2054_CREATE_MULTI'

           EXPORTING

             I_PROJECT_DEFINITION = gv_project

           TABLES

             IT_WBS_ELEMENT       = gt_wbs_element_bapi

             ET_RETURN            = gt_return

             EXTENSIONIN          = gt_extension_in

*           EXTENSIONOUT         =

           .

Suggestions will be much appreciated and points will be rewarded.

Regards,

Bijoya