Hi,
What i can suggest you is, do the look up (checking the condition in infocube and all ) in the transformation of MD PSA or DSO(whichever is applicable for you) - > Vehicle Frame Number MD.
Start routine:
write select statement from table or infocube (according to your requirement) along with the condtionin.
Rule Details :
Updating the result from the internal table to Result fields.
Hope this information would help you .
Regards,
Punitha.