Oracle 8i SQL command not properly ended

In the SQL statement below I am passing ROUTER_ID and expecting to have the most recent version of RTR_HEADER record along with related RTR_SEQUENCE returned.

SELECT 

   RH.ROUTER_ID,

   RH.DESCRIPTION,

   RSEQ.SEQUENCE_NUMBER

FROM 

   CFG.RTR_SEQUENCE RSEQ

INNER JOIN CFG.RTR_HEADER RH

  ON RSEQ.ROUTER_ID = RH.ROUTER_ID

  AND RSEQ.ROUTER_REV = RH.ROUTER_REV

WHERE 

  RH.ROUTER_REV = (SELECT MAX(RVER.ROUTER_REV) FROM CFG.RTR_HEADER RVER WHERE RVER.ROUTER_ID = RH.ROUTER_ID) 

AND RH.ROUTER_ID = 'XXXXX-XXX'

ORDER BY RH.ROUTER_ID, RSEQ.SEQUENCE_NUMBER

I keep getting SQL command not properly ended with intelligence pointing at the INNER JOIN. If I omit the INNER JOIN and its related table and fields the SQL statement runs. I do get the recent version of the RTR_HEADER record, but I need the matching RTR_HEADER as well. I looked at many of the other existing answers here on SO, taken their resolution into consideration without any results.