Stock Locked in transaction LT10

Hi All,

I am having a problem confirming a pick TO. The error message I am getting is zero cases are available. Where as there is stock available in the pick (and also the TO creation went fine)

When I display the stock in pick using LT10 I see a lock on the stock. Can anyone say why could there be lock on the stock and not available for use?

Please advice

Thank you in advance