The manual and code for the mged oed command does not perform as documented. Example:
mged> in a sph 0 0 0 1
mged> g g a
mged> l g
mged> oed g a
Error: Unable to find solid matching path
This issue has been resolved in the latest (unreleased) version of the source code. Thank you for bringing the issue to our attention! You're welcome and encouraged to test and make sure this issue is resolved after the next source release of BRL-CAD.
The documentation was missing the detail that the arguments of the oed command must be currently displayed, i.e., for "oed g a" to work, g/a must be displayed.