Doubt about BAPI FM

Hi ALL

Can any body tell me how this FM works..

Can i use it to get the Scheduling agreement details from this

CALL FUNCTION 'BAPI_PO_GETDETAIL'

EXPORTING

PURCHASEORDER = W_EBELN

ITEMS = 'X'

• ACCOUNT_ASSIGNMENT = ' '

• SCHEDULES = ' '

• HISTORY = ' '

• ITEM_TEXTS = ' '

• HEADER_TEXTS = ' '

• SERVICES = ' '

• CONFIRMATIONS = ' '

• SERVICE_TEXTS = ' '

• EXTENSIONS = ' '

IMPORTING

PO_HEADER = THEADER

• PO_ADDRESS =

TABLES

• PO_HEADER_TEXTS =

PO_ITEMS = TEKPO

• PO_ITEM_ACCOUNT_ASSIGNMENT =

• PO_ITEM_SCHEDULES =

• PO_ITEM_CONFIRMATIONS =

• PO_ITEM_TEXTS =

• PO_ITEM_HISTORY =

• PO_ITEM_HISTORY_TOTALS =

• PO_ITEM_LIMITS =

• PO_ITEM_CONTRACT_LIMITS =

• PO_ITEM_SERVICES =

• PO_ITEM_SRV_ACCASS_VALUES =

• RETURN =

• PO_SERVICES_TEXTS =

• EXTENSIONOUT =

.