Error in computation of rate and amount when items inserted using barcode

[Maq]

Hi there,
There is error in calculation of item’s rate and amount when inserting items using barcode for the firs entry as illustrated in the figure below:

I defined new UOM, Dozen, and its price (for Cheese item) as below:

I noticed that when the item is scanned again the rate and amount in the record is successfully calculated.

Please ignore the use of not real Barcode and Customer

[volkswagner]

I think you may need UOM Conversion when stock and sales UOM differ.

[Maq]

I already applied the UOM Conversion when first defined the item

When item barcode first scanned in the Sale invoice the rate and amount in the item details is wrong. However, when the item scanned again the above values is calculated correctly!

[Maq]

Thank you @volkswagner. any suggestion is highly appreciated

[Maq]

Please note that this happened when scanning barcode only. If item details manually entered in the sale invoice everything is OK.

[Maq]

any suggestions guys?