I can't believe this is still not fixed.  This is a major bug that needs to be handled asap.  Your use of the customer field is not acceptable as we are required to track every purchase to the vendor and customer to maintain legal compliance.  We deal with single customer orders that may result in 2000 different line items from 300 vendors.  This is a problem that is costing us hundreds or even thousands of dollars in labor to "simply uncheck" the boxes.   These needs to be corrected immediately.