The ASTI say a decision not to hold parent-teacher meetings outside school hours has nothing to do with them.
There are reports that hundreds of schools may have to close for at least a day in the lead-up to State exams because of the ongoing dispute.
However, ASTI President Ed Byrne does not agree.
Mr Byrne said: "This idea that it (the school) would have to close for a day, I'm not really sure where it came from.
"But the truth is, and I keep pointing it out, that ASTI members have given 12 unpaid hours to get a lot of these parent-teacher meetings done."