Diagnostic inquiry

Question

I have a car BMW e46 318i 1995 ccm with engine n42 (143 hp) made 2004 / Jaunuary.

When analyzing OBD data with Konnwei KW850 diagnostic computer, I checked the fuel mixture preparation. I need help with one piece of information.

A diagnostic computer displays "datastream", where they are basic informations on fuel preparation. In total, you will see 3 data, 1 informace for "Long term fuel trim",
and 2 informations for "Short term fuel trim" ==> here is an example:

Short term fuel trim - bank 1 === 0.0% (I understand this information)
Long term fuel trim - bank 1 === 3.1% (I understand)
Short tern fuel trim - bank 1 - sensor 2 = == 99.2% (I do not understand).
What does mean Short term fuel trim for Bank 1 - Sensor2 with 99.2%??

Thank you.