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RonS1 It's a very difficult question for me to ask, I believe it would be best suited for the manufacture of the Panels, the IHD and then who did the install.
The wording on the Ivie (
https://ivie.co.uk/eonnext/) which is one we have an affiliation too states, a pylon will appear on net exportation. Again the system would need to be compatible for this to show. I've seen a leaflet advising it will show, based on the system being compatible. I will try to find this for you.
If you're exporting then technically by definition your using less than being generated etc so I would expect to see a pylon, again not all systems and IHDs are compatible. So if it's working for you and not for someone else there is every possibility that your install is compatible and theirs isn't.
We can never predict the future nor can we predict the technology that will or not be available, however, in terms of FIT & SEG - We don't accept reads or data from an IHD anyway, you can work out everything manually using the meter reads
Let me know if you have any further questions.
Thanks