Need to create a Network and assign this n/w to WBS

I was trying to create a network from abap editor using the  'BAPI_BUS2002_CREATE' but I have encountered a dump. Here is my entire code below:-

*  Declaration based on the Import & Export parameters of BAPI create  

DATA LV_AUFNR TYPE NW_AUFNR.
DATA LV_NETWRK TYPE BAPI_BUS2002_NEW. 

DATA LT_RESULT TYPE TABLE OF BAPIRET2.  

PARAMETERS: P_AUFNR TYPE NW_AUFNR. " Order Number

*  Trying to pass the value of network entered in parameters to the FM for creation.

LV_NETWRK-NETWORK = P_AUFNR.

CALL FUNCTION 'BAPI_PS_INITIALIZATION'.

CALL FUNCTION 'BAPI_BUS2002_CREATE'
   EXPORTING
     I_NETWORK          = LV_NETWRK
   TABLES
     ET_RETURN          = LT_RESULT.

CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'.

Regards.