I'm finding the same problem with the Intercode software I'm currently setting up - hence my current scratch around the SIC code issue.
What I do know (from the time I was actively involved with AgriSETA) is the SIC codes are (or were) being made more granular and has been added to in a fairly big way over the past 5 years or so. What I don't know with absolute certainty right now is who is in charge of generating them (just who is the authority here?).
I also suspect issues with matching them up across different sources, although I haven't got to closely interrogating that aspect as yet.
When it comes to the limitations of software in this regard, I expect our next step would be to give the software developers feedback on the issue.
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