Modelo 210 is used to report both imputed and actual rent income. Assuming you selected the right type it probably gets rejected because quarterly submission must be done within the first 20 days following each quarter.
Personal experience advice is to wait until January 2017 and report total income for the entire 2016 by selecting 0A as period in the form.
There is a very good chance you will not even be charged penalties.
Everything you need to know about property in Spain
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