ProConnect recognizes "-1" as 0 in the software.  For any month that is blank on the 1095-A form, enter "-1" in that respective month in ProConnect so that it acknowledges that as $0 received.

When I enter -1 in the field it turns Red with a small triangle and I get the message "Some values are invalid". 

SLCSP (second lowest cost Silver plan) values (column B) are provided, either from the form, or you have to look up what they would be for your taxpayer from the Marketplace. That's one of the baselines for knowing if the premiums were "affordable." Zero value is not allowed.

Thanks for the response. The client didn't receive any credits for 9 months out of the year and the Form 1095-A is blank for the months when they didn't receive anything. Another client was in the same situation and leaving the fields blank did not cause any error messages.

I'm not certain how ProConnect works, but generally if the 1095-A show zero for all three column, you leave that month BLANK (not zeros).

If there is a number in one of the columns, you can fill out the columns.

If there is something in column A or column C, you can't leave column B (the SLCSP) blank or zero.  You need to look up the proper amount.  If the circumstances are that it really should be zero (such as they were eligible for employer insurance), then you would enter 0.01.

The "-1" does work but it all depends on your client's specific situation.  If you are still having an issue, please contact the support line where we can have you send over your actual return so that we can see the full inputs to assist you better.  In some situations, it is a paper file situation but we would need to see the return to determine that.