Why is the modified Sales Tax Table not applied to my existing items?
Any changes to the Sales Tax Table is only applied to new items listed after the change is made. The change is not propogated to existing items.
If you need to apply the new Sales Tax Table to existing items, then you need to make a call to ReviseItem individually for each of the items. Here is an example of how to apply your new Sales Tax Table to existing items:
<?xml version="1.0" encoding="utf-8"?>
<ReviseItemRequest xmlns="urn:ebay:apis:eBLBaseComponents"> <WarningLevel>High</WarningLevel>
Note: To apply sales tax to a item, you need to specify atleast one ShippingServiceOption.