OK I see that the field order contains a macro call so it needs to be 
evaluated before you pass it to calc. So do the following:

\define precalc(value, operation, by)
    <$macrocall $name="calc" *value="$value$* *operation="*$operation$"  
*by="*$by$" decimals:2 />
\end

<$macrocall $name="precalc" *value={{*!!order}} *operation="*/"  *by="*7"  
/>

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