Quantity Variance Encumbrance

Dear All,

I have this issue with my client where a PO was raised and approved, after which the invoice was matched to the PO and validated but then the invoice was cancelled.

Another invoice was raised and matched to the same PO, the invoice was validated and paid for in full. When checking the accounting entries , we noticed these entries

The question is why is there an accounting entries for Quantity Variance for encumbrance and also why is Purchase order 0.00 and item expense 0.00

Anyone with an answer should please help.

Thanks