Package versioning requirements for an epk

Can someone explain/confirm the versioning requirements for an epk
package distribution?

From what I can tell, you used to be able to get away with
$PACKAGE/current, but it looks like ecosadmin.tcl might have been
updated to force proper verisioning. The package I am testing does use
'current' as the version directory in the epk, but the ecosadmin.tcl
tool is barking about the package not having a version directory.

Thanks,

-- 
Mike