Having trouble writing Boolean Line Item

Hi,

 

I'm having trouble writting a Boolean Item that checks true if it is the 10th of the Month or the next business day if the 10th falls on a Weekend. The following is the formula I was using but not working. Thank you 

 

INPERIOD('S01 Time Filter'.Start of the Month + 9, 'S01 Time Filter'.Month)

Answers