PAYE Dispensation

I read below from the news from Revenue, but could not understand well.
If someone can help explain, I'd be so grateful!

"PAYE Dispensation Applications – During 2020, Revenue did not strictly enforce the 30-day notification requirement for PAYE dispensations applicable to short term business travellers from countries with which Ireland has a double taxation treaty who spen in excess of 60 workdays in the State in a tax year. This concession ceased on 31st December 2020 and, since 1st January 2021, employers are expected to adhere to the 30-day notification timeframe. Exceptional cases may be notified to Revenue as required."

Here, can anyone help explain:

What does "PAYE Dispensation"mean, is it same as "PAYE Obligation"?

Thanks a mill!