I have exported a process from GaBi in ILCD format but without going through the standard GaBi mapping onto reference ILCD flows. When I check the ILCD xml file the category information is present. When I import the ILCD file into OpenLCA no categories are created for the elementary flows resulting in seemingly duplicated elementary flows for substances present under multiple categories.
The export from GaBi without the ILCD mapping can be accomplished by first deleting the following files from C:\Program Files\GaBi 4\SysData
Ideally I would share the data I exported here, but the license prevents this. The process I tested on was the crude oil mix for Germany.
Screenshot of showing the database containing the single process I imported, the category structure, and the duplicated elementary flows: