When registering for an event using the Event Registration Form 2.0 in which the maximum registrants available per checkout field is set, step 1 on the form allows users to add more than the maximum allowed. On step 2 of the form, selecting a number higher than the set maximum from the quantity drop-down will result in the error, "Maximum allowed registrants per checkout is [Maximum number set on the form]".
This has been resolved in Service Pack 18 (18.104.22.1684). Please download and install the latest Service Pack or Hot Fix which contains all fixes from previous patches.
Steps to Duplicate
1) Add an Event Registration Form 2.0 2) Under options, set the Maximum registrants available per checkout to 2 3) When registering for the event, add 4 attendees on Step 1 of form > Click continue 4) On Step 2 of the registration, set the quantity to 4 > Click Next 5) Notice you get the error "Maximum allowed registrants per checkout is 4"