The above report almost does what I was hoping for but modifying it to Select Only the Materials Cost Code caused some strange results and a blank Cost Code column.

What would be the best way of extracting Material Costs only ?

These would basically be corrections to mis-keyed data as in the image below

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As a temporary measure I used the Send Data to Excel option of the Summary report and then filtered by material code but it isn't necessarily easy to check if those records extracted are genuine Project-Only Transactions (Ie what I believe to not have an account ref)

Thanks