Replaces are already here :
Package: libxmlrpc-core-c3 Replaces: libxmlrpc-c3 (<= 1.06.27-1ubuntu1)
Package: libxmlrpc-core-c3-dev Replaces: libxmlrpc-c-dev, libxmlrpc-c3-dev (<= 1.06.27-1ubuntu1)
Replaces are already here :
Package: libxmlrpc-core-c3
Replaces: libxmlrpc-c3 (<= 1.06.27-1ubuntu1)
Package: libxmlrpc- core-c3- dev
Replaces: libxmlrpc-c-dev, libxmlrpc-c3-dev (<= 1.06.27-1ubuntu1)