Uploading components into a Service Order

Hello,

My head is blowing away since I´m not able to load components into a Service Order:

I´m trying to use the BAPI: BAPI_ALM_ORDER_MAINTAIN

Parameters are set as follows:

IT_HEADER

ORDERID: My service Order

ORDER_TYPE: ZS02

PLANTPLANT: My plant

PLANT My plant

IT_METHODS

Entry 1

REFNUMBER: EMPTY

OBJECTTYPE: EMPTY

METHOD: ‘SAVE’

OBJECTKEY: EMPTY

Entry 2

REFNUMBER: '000001'

OBJECTTYPE: ‘COMPONENT’

METHOD: ‘CREATE’

OBJECTKEY: My service Order

IT_COMPONENT

MATERIAL: My ID SAP

PLANT: My plant

STGE_LOC: My storage loc.

ACTIVITY: My Activity

UNLOAD_PT: Any text

ITEM_CAT: L

GR_RCPT: Any text

REQUIREMENT_QUANTITY: Quantity

RESERV_NO: My Reserv_No

RES_ITEM: New item possition

Result from the BAPI:

S IW 080 Order saved with number XXXXXXXXX

S IWO_BAPI2 110 BAPI control was ended

It seems to be successfully completed but if I check the Service Order (IW33) the component is not loaded...

Is it necessary to use BAPI_TRANSACTION_COMMIT after executing the first one?

Thanks in advanced for your support.

Regards

Tomás.