There is a bug in MAS 4.5 when trying to distribute lots against item lines in SO or SO invoice. When trying to distribute a lots for an item, the lot information shows up but when you click or try to enter the lot manually the system will not take the lot (the field just stays blank). This client has been using dashes ""-""in the order number (i.e, 1000-00), and I confirmed that the dash is causing the problem.