Thanks

Cool. They showed up with my dishwasher. Many thanks.

But what do they actually mean? percentage of what?

I don't really know exactly. The only thing i've notice is that they are related to the current active program

I found this screenshot in an amazon review for some HomeConnect capable dishwasher.
I suspect that Energy and Water forecast are probably used for those controls there.

The question is where the absolute number is coming from.
Simple lookup per device and then multiply by some max value?

The screenshot seems to be for a SN87TX00CE.

Spec sheet for that one says 9.5L for the eco program
https://media3.bsh-group.com/Documents/specsheet/de-AT/SN87TX00CE.pdf

That is more than in that screenshot

Yes, that is what I also suspect. Most likely is has something to do with the EU energy label. There is some absolute value which is the worst energy class, and depending on how much less you use, you get a better class. But I never found a clear definition of these values.
My dishwasher displays 30% for the eco program, which results in 0,36kwh (measured by a Shelly) energy consumption. 100% would then be something around 1,2 kwh.
The water consumption I don't measure.

Okay, so it appears that Pre-Rinse is the program with the lowest forecasts for my SN45ZS49CE.

Specifically, 2% for energy and 18% for water.
It also just runs for 15 minutes, so conceivably, running this a few times might give a good baseline to calculate the absolute values for the device.
Those could then be compared with other programs

There must be some constants somewhere though, but if they're impossible to find, that might be an alternative solution

So I bothered to check in the app and interestingly enough, mine does not have any kWh or Liter values.
Question is if that is just my setup or my model of dishwasher

Two runs of the Pre-Rinse later, I do have a somewhat plausible 4L consumption for 18% Water Forecast.
This would be 22.22L for 100%

The eco 50 program for my unit forecasts 41% for Water usage, which would be 9.1L

This is somewhat close to what I can see on the energy label for my device (9.5L, 0.75kWh per eco cycle)
https://media3.bsh-group.com/Documents/energylabel/de-DE/SN45ZS49CE.pdf

Power consumption led to less plausible values. Likely because it's so little with no heating going on.

Anyway, this could also perhaps be a way forward (and might also be how they've implemented it?)
Just take the forecasts percentage for the eco program and multiply those with the values on the energy label to get to 100%

Or maybe this is a red herring and instead, 100% is just a single constant over all dishwashers?

It doesn’t seem to be a single constant, the 100% value changes with the Program.

From my Dishwasher (0.63 kWh 8.5 l):