Change in Excise Rates
Let me provide an example.
1000 units of RM procured under 4% excise in Feb-10, lying as on hand stock.
On 01-Mar-10, GR makes excise at 8%. Hence all transactions will now be at 8%.
On 02-Mar-2010, an ISO is created to transfer stock to another location. For this ISO, the excise rate will be 8%, but stock was procured at 4%. As per excise rules, this is not allowed since an additional 4% is being passed as credit.