Advanced comparison of form values in a transaction. Use "Compare Transaction Fields"?

I have a form for textbook requests which has, among other fields, these:
Campus Enrollment
Current number of textbooks on campus
Number requested in this instance
I want to disallow form submissions where the {currentnumber}+{requestednumber}>{campusenrollment}
In other words, if I say I have 500 students, and claim that I have 50 books already, then my max current request is 450.
I have been experimenting with the "Compare Transaction Fields", but am not sure what I am doing.
Any suggestions?

Hi,
I´m not certain if the "Compare Transaction Fields" behaviour allows such advanced calculations at all, but if it does, your formula -- at least according to my basic understanding of math :-) -- certainly needs to first add "currentnumber" to "requestednumber" and make this a "group", and then compare the grouped value to "campusenrollment" :
({currentnumber} + {requestednumber}) > {campusenrollment}
Cheers,
Günter Schenk
Adobe Community Expert, Dreamweaver

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Thanks for the reply ......
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