If you don't have open transfer requirements then just create manual TO's with LT01 and movement 999 to get it out of 921 storage type.
Find the movement in MB51 which was used to receive this stock. In the detail of this movement you should see the TR number.
Check then the TR in LB03 and see if it was cancelled or find the TO number with Shift+F5
Then check what happened with this TO .