First use this BAPI to read information
BAPI_ALM_OPERATION_GET_DETAIL
Then...
I_METHODS-REFNUMBER = '000001'.
I_METHODS-OBJECTTYPE = 'OPERATION'.
I_METHODS-METHOD = 'CREATE'.
I_METHODS-OBJECTKEY = order number
APPEND I_METHODS.
I_METHODS-OBJECTTYPE = ''.
I_METHODS-METHOD = 'SAVE'.
APPEND I_METHODS.
I_OPERATION-ACTIVITY = activity
I_OPERATION-CONTROL_KEY = control key
I_OPERATION-WORK_CNTR = workcenter
I_OPERATION-PLANT = plant
I_OPERATION-DESCRIPTION = description
I_OPERATION-LANGU = language
APPEND I_OPERATION.
CALL FUNCTION 'BAPI_ALM_ORDER_MAINTAIN'
TABLES
IT_METHODS = I_METHODS
IT_OPERATION = I_OPERATION
RETURN = RETURN
ET_NUMBERS = ET_NUMBERS .
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
EXPORTING WAIT = 'X'.