Hi Mark,
welcome to the show!
Well, BE is a pure German term! It's the abbreviation for Broteinheit ("Breadunit") This is a German term for exchange units to make the calculation of insulin doses easier for the patients: We have BE-declarations on many many nutritions, like frozen meals and with this information we can use an easier formula with BEs instead of carbs and we are also using BE ratios instead of a carb ratios.
This helps us to calculate with smaller numbers because 1 BE means 12 grams of carbs.
Both calculations will bring identical results, but it seems that calculating i.e.
6BE * 2IE/BE = 12iE (formula with exchanges) is easier for the people than
72gr.carbs / 6gr/iE = 12iE (US style formula)
The first number is the amount of intake, the second number is the ratio for your bolus calculation depending to how the diabetics are calculating in their countries. The ratio in Germany means: For each BE I need to inject 2 IE of Bolus insulin. The US ratio means: Each iE of Bolus insulin covers 6 grams of carb intake...
You could also look into the manual because there's a chapter with a detailed explanation and also some more examples for the two possibilities of calculating with grams of carbs directly (US style) or calculating with exchanges...
Cheers, Alf.