Sorry about digging deeper into this (your customer) problem (without providing the solution you seek), but a few more questions/suggestions.
“keeps track of when an employees fills out documents incorrectly” so I assume they do it ‘by hand’ (correct?). Not the answer to your question, but is it possible to automate the process and have the documents fill electronically? If done right - with all validations of the input data - it is impossible to fill documents incorrectly. And no need to keep track of the problem because there will be no more problems.
Just curious...
Have fun.
---- Andy
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station.