Function module - Urgent

Question

Hi Friends,
I have a statement as below in one function module :
      SELECT a~matnr
        INTO TABLE t_mast
        FROM mast AS a
       INNER JOIN stko AS k
          ON astlnr EQ kstlnr
         AND astlal EQ kstlal
       WHERE a~werks eq plant
         AND a~stlal eq alt
         AND k~datuv EQ date .
Import parameters are : Plant , Alt and Date.
Here the problem is while I am executing the f/m it is giving the correct values only if input all the input parameters Plant,Alt and Date.If I give Plant and Alt as blank then it is not giving any values from the table.
Could you please telme the resolution for this.
Regards,
Vishnu.
If I am not

Answer 1

You can overcome from this problem by using the RANGES.
Like:
ranges: r_alt for mast-stlal,
        r_date for stko-datuv,
        r_plant for mast-werks.
if not alt is initial.       
r_alt-sign = 'I'.
r_alt-option = 'EQ'.
r_alt-low = alt.
append r_alt.       
endif.
if not date is initial.       
r_date-sign = 'I'.
r_date-option = 'EQ'.
r_date-low = date.
append r_date.       
endif.
if not plant is initial.       
r_plant-sign = 'I'.
r_plant-option = 'EQ'.
r_plant-low = plant.
append r_plant.
endif.
SELECT a~matnr
INTO TABLE t_mast
FROM mast AS a
INNER JOIN stko AS k
ON a~stlnr EQ k~stlnr
AND a~stlal EQ k~stlal
WHERE a~werks in r_plant
AND a~stlal in r_alt
AND k~datuv in r_date.
Regards,
Naimesh Patel