Hi Neil,

I should advice a script solution on this on.

In the Script add a left join to the Order-Menu-Items.

LEFT JOIN ('Order Items') LOAD

Order-Menu-Items,

Cost

FROM Menu;

If you can't edit the script then you could calculate the correct number with this expression (assuming that there is only 1 cost value per Order-Menu-Item). :

COUNT(Order-Menu-Items) * Cost.