Self Attachments not merging

Version 08.11.09.459

I am trying to save a file with multiple models and references to a file with all references merged. The options are set to merge all external attachments and all self attachments yet when I open the newly created file the self attachments are not merged. I noticed that in the original file the self attachments are marked as Write Locked. How can this be changed so that self attachments are merged when saving as (or exporting)?