Hi,
Did you check the source system (rsa1 -> source system -> check). If you don't get any error then there maybe a problem with your transfer structure (3.x dataflow).
Even if the transfer structure (infosource) looks activated, try and activate it again (the activation will ask you a TR so you have to transport this from Dev to Prod. The replication will not solve your problem if there is a problem in the infosource.
leo