Warehouse to warehouse transfer cause a committed to an item, how can i clear this?

Hello,

I'm having an issue with a warehouse to warehouse transfer that is racking my brain, no pun intended. A user made a transfer and when i went to update it, it showed 0 entries. When i asked if he added an entry he said yes. Also the quantity in his warehouse shows the correct available, if the transfer would have occurred. I turns out the quantity he was trying to transfer is now a committed quantity. I don't know how he did it but i can't clear it as its not a sales order. Can anyone help me with this issue?