Edgar Kohler gave a very good explanation on SAG-L:
"It should be the value of Add2 field (3rd and 4th bytes) containing the
name of the descriptor which caused the uniqueness conflict.
49896 = H’C2E8’ = ‘BY’ "
It also could be that RC 98 is similar to RC97 and RC99:
An I/O error occurred… Additions 2 may contain RABN.
We unloaded a file on the mainframe, decompressed it w/o the ISN option, and compressed w/o the USERISN option. The load also was w/o the USERISN option on the Windows platform. The replication, of course, couldn’t find the
same ISN/RABN and abended with the above mentioned RC 98, SC 49896.
Thanks, Edgar, for the excellent tip.