Hello Praveen,
GOOD NEWS
Finally I believe am able answer your query.
The Table you need is KSSK_INOB (view)
See the picture below (SE11)
I passed the Equipment number to the field INOB_OBJEK field of this Table. (You can also fill OBTAB field with value 'EQUI' for quick response). See what we got.
I got the OBJEK number which we needed to pass to AUSP table. I think the Mission has been accomplished .
So the join is
EQUI-EQUNR <--------------> KSSK_INOB-INOB_OBJEK
KSSK_INOB-OBJEK <-----------------> AUSP-OBJEK
Regards
KJogeswaraRao