Problems with pending delivery


I’m having problems when trying to perform the procedure pending delivery. In the Sales Order screen, I select the sales order that has items that are pending delivery. Then I select the item that has pending delivery. Then I click the Functions button for the items, and I select the Pending Delivery option. After this process, I have the following error:

The quantity ordered can not be reduced because there is not enough stock transactions with status ‘in order’.

Items are Sold, or Separated deducted.

Error changing outstanding amount.

Does anybody know what’s missing so I can complete the process?

Below, I submit one print a sales order in question. I thank you. Hugs!