enque/replication_failed_cmd is a SAP Parameter attribute which is used to control Command string to be executed when repl. reload fails information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
A command (including optional parameters) to be executed if the loading
of the lock table from the replication system fails. This parameter is
only relevant on the enqueue instance.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.