The MODS export from ArchiveSpace does not have as much data as the MODS export function from ArchivistToolkit. Several options for proceeding with this:
Explore using the EAD export functionality and then converting to MODS (could be quicker but i don't like relying on TWO different conversion utilities, more chance of breaking)..
Create a plugin to do this (unsure how long this will take)
Wait for the next release of Aspace--- maybe this is fixed then? (easiest, but will involve waiting)
Modify the actual code and suggest a patch to the Aspace folks (most time likely)
The MODS export from ArchiveSpace does not have as much data as the MODS export function from ArchivistToolkit. Several options for proceeding with this: