"I" means "internal". It's the memory SAP uses to store different pages/parts of a transaction. For example, if you entry VA01 you'll see imode with value 0. Then as you double click into the order creation, you'll see imode 1. Then if you go into a single line item, you'll see 2. When you click the green arrow back, you'll see the number go from 2, to 1 to 0.
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