To created as a result of 101 is having the reference of TR created for the initial material document now since you are cancelling this you need to return back the stock to 902
normally the process flow is once you perform the GR against PO
it post the stock to 902 now in your case you mentioned automatic TO gets created and confirmed so check what is the destination storage bin in the first TO (Once TO confirmed you cannot cancel it)
Now as a result of cancellation you will have Negative Quant in 902 so using T-Code : LT01 or LT10 you can transfer the stock from physical bin to 902 to make it zero