If it's not too late for an AR suggestion, here is something that would greatly help users, not only in AR but other modules as well.

When you are EDITING a customer (similarly when you are editing an inventory item) it would be a HUGE help if you could click NEXT to save your changes and proceed to the next customer (or next inventory item) instead of having to say OK and close. Then have to open the next one on the list.

Also, if a customer's terms are COD, the Credit Limit warning in OE is a really annoying distraction. It creates an unneccessary extra step and users get so used to ignoring and saying okay, that it creates a potential to not even notice when it's a legitimate "over their credit limit warning". Setting the Credit Limit really high on COD customers is the only way around the warning screen and is not a great solution because if that customer is later approved for terms, it could easily be mistaken as their starting Credit Limit and lead to excessing spending on credit without anyone noticing.

One more thing that I mentioned previously that would be a HUGE help in both AR and IC is if you could HIGHLIGHT and COPY fields from the VIEW CUSTOMER LIST and ITEM INQUIRY windows. Because of this inability, users tend to use the EDIT CUSTOMER LIST and ITEM MAINTENANCE screens, so they can easily copy and paste to an email. This creates 2 problems. 1. It locks out other users from accessing those customers/items at the same time. 2. It opens up the potential that they might accidentally change fields when copying and pasting and then accidentally save their changes when clicking okay.