would like to see a pop up warning that when you change method of salesmen commission payment, example:  change from payment upon invoicing to payment upon payment of invoice, there is not a warning that commissions will be paid twice until the older already invoiced amounts are cleared.  Seems like maybe a suggestion of the option to change Salesman # would keep that from happening.  
Of course Lynn was great to tell me how to "fix" the entries that will overlap, it is just a lot of extra work.