Dear Paul
I agrre to what Mark has explained. As it is not very "probable" that you have established here own coding (which would not be that easy in this case) to get results.
E.g. if you enter in one spec CAS nr. 50-00-0 but the othere spec of hit list does not have this identifier assigned. why should system show this spec only?
You should try to reproduce this system reaction in a "qual" system and analyse with help of ABAPer.
C.B.