Hello,
If you're using SAPinst to install SRS I assume it is for HADR in a Business Suite environment purpose.
SRS 15.7.1 GA version (media 51043974 - DVD - Replication Server 15.7.1 Linux x86-64 64-bit) , 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