#value from formula that won't ignore anything other than numbers

With in the FI-A sheet the formula in G43 works correctly and all other totals are correct. The problem is that if someone enters a "space" to clear info in an above cell it will return a #value in the formula below...I formatted it to turn grey so they would know where to delete the cell above to correct. With in the FI-B sheet I changed my formula in G43 so it would not return #value but now my totals that come from the mileage row wont calculate correctly because the first part of the formula would need to include the value in B10 also to make it correct. Remember the numbers on FI-A are correct.

The problem is that if someone enters a "space" to clear info in an above cell it will return a #value

For a start, I would make sure they DONT enter a space to clear data - tell them them pushing DELETE is only 1 key-stroke, and simple to do, whilst if they press space, they still have to press enter - 2 key strokes.

Also, you can shorten that formula somewhat by using this...
=SUMPRODUCT($C$11:$C$35*H11:H35)+H10*$B$10*$C$10

I notice that you have the answer cells formatted as text? leave them as numbers, it will keep things simple

I can totally understand that, and I think I have come up with a solution for you, using Data Validation...

Highlight the entire "entry" range. on the Data Tab, select Data Validation, under "allow", select Custom, under "formu;a" enter this...
=G10<>" "

I think you will need to enter an error message, so click "Error Alert" tab and enter something like...
"Use DELETE, not SPACE!!!. Press Escape to Continue"

Im pretty sure that after wasting their time with constant "escape", they will mend their ways

Happy to help and thanks for the feedback

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