Change B2 to F1, patronymic name vs. middle name?

[tc1981]

Hello,

I am applying for change of status from B2 to F1. Can I write N/A in middle name or I have to write my Patronymic name? I am Russian and we have Patronymic name, we don't have middle names, in my passport just my First and Last name, but on my US visa and I-94 written my First, Patronymic and Last name. Did anybody who has patronymic name file for change of status and got approved?

Thanks