SRM Process Controlled Workflow - Re-start using FM BBP_PD_SC_UPDATE

Hi All,
We are upgrading from SRM4.0 to SRM7.0 SP07 in classic scenario. We switched to Process Controlled Workflow.
We have a CUSTOM application where the requisition items are entered and a Shopping Cart is created in SRM through Function Module BBP_PD_SC_CREATE. When the Shopping Cart is created in SRM , the Process Controlled Worflow is triggered successfully.
In the custom application , we allow users to do changes to the requisition that are awaiting approval.The changes are updated in SRM Shopping Cart through function module BBP_PD_SC_UPDATE. It is noticed that the workflow process levels are not re-started after the shopping cart is updated through FM BBP_PD_SC_UPDATE.
However , the process levels are re-started when the change is directly done to the Shopping Cart in SRM POWL. We want the process levels to be re-started even when the changes are done through BBP_PD_SC_UPDATE. The users are used do changes to the requisition through the custom application. We also noticed that system does not go through BAdI /SAPSRM/BD_WF_PROCESS_RESTART when changes are done to the SC through BBP_PD_SC_UPDATE.
Is there any way that we can trigger process level re-start when SC is changed through FM BBP_PD_SC_UPDATE
Thanks
Sukumar

HI ,
       This is not the correct way of updating the SC. please check the below process...
       first you try to get the SC document in Edit mode and this can be done only SY-UNAME should requester of the SC or( user who are changing the SC should be in the Org structure ).  ( This point why i mentioned is you mentioned that your editing through custom application ). 
  note : use try and endtry and catch the exception when u get the SC document in Edit mode.
  DATA: lo_pdo_sc             TYPE REF TO /sapsrm/cl_pdo_bo_sc_adv.
      "Instance SC PDO Layer
      lo_pdo_sc ?= /sapsrm/cl_pdo_factory_sc_adv=>get_instance( iv_header_guid   = p_guid "ps_shopping_cart-guid
                                                                iv_mode          = /sapsrm/if_pdo_constants_gen_c=>gc_mode_edit ).
   now you do what ever changes to the document. I mentioned points below.
        "Get Item Details
      lo_pdo_sc->/sapsrm/if_pdo_bo_sc~get_item_detail
do changes to the items of the SC.
       "Update SC Items
      lo_pdo_sc->/sapsrm/if_pdo_bo_sc~update_items
       "Submit Update
      lo_pdo_sc->/sapsrm/if_pdo_base~submit_update
       "Save SC
      lo_pdo_sc->/sapsrm/if_pdo_base~save    
      or  order  the SC again.
      COMMIT WORK AND WAIT.
regards,
Devi

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    **SDN Forum Moderator:
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    **SDN Universal Worklist Wiki:
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             lv_admin_type TYPE sy-input,
             ls_agent      TYPE  /sapsrm/s_wf_approver.
       CALL FUNCTION 'SWD_WF_DEFINITION_ADMIN_GET'
         IMPORTING
           default_admin_expr = lv_admin_expr
           default_admin      = lv_admin
           default_admin_type = lv_admin_type.
       ls_agent-approver_id = lv_admin.
       APPEND ls_agent TO rt_agent.
    ENDMETHOD.
    Error of agent determination:
    Please let me know the result of the test with the implementation of method GET_FALLBACK_AGENT. By doing this we could ensure if really the problem is in method GET_APPROVERS_BY_AREA_GUID or before.  I just made the test in our system and I'm almost sure that you wont get the default approver, but i could be wrong. 
    Any question please let me know.
    Best regards
    Cristian R.

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