Dealing with this presently on a 410 to 450 upgrade with Ext Sol Mod. I did get the conversion to run finally. However I did have to generate new 450 files for the couple modules affected. Now for some reason I can't find the article reference. But basically I had to take fresh inventory files (new activation on dumby company) and replace the ones that were present. I determined which module to do by running the embedded io script in the 450 release and those that weren't successful I replaced the BF files with new ones. Zero returned on SO and IM but only had to replace BF files in IM.