I suspected as much
add a hidden element in the repeat region that will store the maximum number of tickets for each line. 
Ok, I did this
outside of the repeat region, add another hidden element. the repeat region uses an incrementing number on each element name. Use the variable for this incrementing number as the value for this hidden element. this will pass the number of lines that the repeat contains.
I created a field called field count, using $RepeatSelectionCounter_1 as its value, (but the value doesn’t seem to match the number of lines)
use that in a loop to compare the quantity field with the max quantity field.
I did this, setting a flag called $invalid to true if the ticket limit exceeds the ticket quantity.
I then added the invalid flag as a criteria to my insert behaviour, so it doesn’t fire if invalid is true.
What this achieves is a pass or fail, which a big step in the right direction.
What I would like to do is show the pass or fail on each row.
I have attached the code to help clarify
