RE: What is the purpose of Tax Schedule ID field in Purchase order Entry window
Richard, just a quick question - if the item in the line already has a tax schedule attached, then I would expect nothing to change on the line level if you change the main page Tax ID.
However, if the item is missing one, or the item is a non-inventoried item or it is created on the fly, then I would see the Main Page acting as Default for that item.
Going back to basic Tax rules -
Item tax detail must equal Vendor tax detail must equal Company tax detail.
Tax Schedules are potentially a collection of Tax Details
Just my two bits worth of think time.