In my model:

In Transformation/Electricity Generation, I set both "Import To Meet Shortfall" and import target. If outputs less than requirements,the results reveal that Energy Balance/Electricity/Unmet Requirements had values ,but Energy Balance/Electricity/imports did not have values.

In Freedonia:

I changed Freedonia values to make outputs less than requirements, I set both "Import To Meet Shortfall" and import target equally.on the contrary, the results reveal that Energy Balance/Electricity/ imports had values,but Energy Balance/Electricity/Unmet Requirements did not have values.

So why there is a difference?

Thanks for your kindly help.