Hello,
If you're using SAPinst to install SRS I assume it is for HADR in a Business Suite environment purpose.
You are trying to install the SRS 15.7.1 GA version, which has never been certified for Business Suite, hence SAPinst will fail.
SRS 15.7.1 started to be certified for Business Suite since SP 100.
To get a SRS SP certified for Business Suite, go to SWDC -> Support Packages and Patches | SAP Support Portal -> Support Packages and Patches -> A-Z index -> Select Sybase Replication Server.
Only the SP with the mention 'also certif. for Bus. Suite' can be used for HADR in a Business Suite environment.
HTH
Regards,
Cris