enque/disable_replication is a SAP Parameter attribute which is used to control Disables the enqueue replication system 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 .
You can use this parameter to deactivate the enqueue replication
subsystem (if it exists).
The parameter is only relevant on the enqueue instance and can have the
following values:
0 = Activated
1 = Deactivated, but if an old replication subsystem exists, it is
invalidated
2 = Completely deactivated
See SAP Parameter Documentation for full SAP documentation for this profile parameter.