When I run a Check Data Integrity I get a message that says that "Data inconsistencies have been detected"

It is showing my A/R Balance as $301.36 and my Unpaid Invoices as $301.38 a difference of $0.02

My Accounts receivable account is $301.36

When I run my customer aged summary it is only showing $257.84 as outstanding, I am at a loss as to where the difference is?

If I add up the amounts owing in my customer list it adds up to 308.27 - different again????

If my outstanding invoices actually add up to 301.38, how do I find them, and more to the point how do I fix the data inconsistency?