I have a Project A which depends on Project B; both are internal projects in active development. Say the latest Project A release is 1.1.2 which depends on Project B 1.1.1.
I think you want your local resolver to be in "force mode". Set the force="true" on your local resolver in ivysettings.xml.
See the description of force mode at: http://ant.apache.org/ivy/history/latest-milestone/settings/resolvers.html