Seeing non-zero ACT value for a technology without any commodity linked to it

[Jihoon]

I have a strange observation, which I want to clarify.

By mistake, I didn't put any 'renewable_potential' values for the historical hydro tec I defined ("hydro_hist") for the entire time horizon, which means its input commodity ("hydro_c_hist") dedicated to the tec has no ground. And input and output parameters were defined only from 1965 and on. But there was historical_new_capacity starting from 1950.

Then in the result, I found that ACT has a value for 2020 for the hydro capacity of year_vtg 1960. (lifetime 60 years). I guess there is a loophole where ACT can still show up when all the input/output/renewable_potential are not defined.
Shouldn't it still give zero ACT if there is no potential defined for modeling years?

[danielhuppmann]

Thanks @Jihoon for spotting this issue. But because this issue is MESSAGE-specific, it should go to https://github.com/iiasa/message_ix. The ixmp repository should only be used for issues related to the database connection and generic data management topics.

[Jihoon]

Oops, I thought I was in message_ix. I'll reopen it there.