Dear Shahid ,
can you refer to the following snote
338372 - Migration key does not work
be sure All entries are case sensitive, you can double check your entries in related to source system from *.LOG files in installation directory (
The header entries (GSI) of the export *.LOG file show important information which
is used for the migration key generation) and entries Related to your target system to be retrieved from MIGKEY.log in installation directory in target system
Best Regards
AhMeD