Hi Blangero,
Can you confirm if the difference in excel result is not because you are filtering (based on your where clause) first and then aggregating?
Try this query to see what data is getting aggregated:
SELECT sum(HSL), rclnt,rldnr,rcomp,bilkt
FROM "_SYS_BIC"."tmp.fi.rtc.cube/ZRTC_C_ACDOCA0DL"
group by rclnt,rldnr,rcomp,bilkt;
Regards,
Manjari