1701A vs 1701

I know madami na nagsabi na 1701 is for mixed income and 1701A is if purely from one income. So we filed 1701A instead of 1701. We are employed and at the same time we also have a rental property. So dun sa rental ang finafile namin is 1701A. And according sa aming accountant eh sa ITR daw pwede 1701 or 1701A depende sa gross income kahit mixed income pa. So please enlighten me kung ano ba talaga or okay lang ba talaga na 1701A ang ifile. Hindi ba kami mafaflaf ni BIR? Thank you!