Hello Edmond,
There can be a couple of things that might be responsible for this.
One possibility is that you posted the transaction with a $0 price (see your prior post).
Another option is that the voucher is pending in the subledger journal not yet transferred form in GL.
Then it might be the item that is used. Is this a stocked or non-stocked item and has a cost price been setup in the cost price tab of the item master?
Best regards,
Ludwig