The string is non-numeric - Crystal Reports 2011

Hello, I'm getting the following error on my tax invoice form.

The String is Non-Numeric.
This is the formula: tonumber({@QTYOrdered})-tonumber({@QtyDelivered})

Example attached in the Word Document.

Can someone please advise the best solution?

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Hmmm - what's the definition of the fields {@QTYOrdered} and {@QtyDelivered} ? I presume them to be of STRING type ...
What is the data they usually contain (list ?)

Just do a simple report with these fields inside (unformatted !), and have a look at the field content. If it contains anything that's not a digit (0-9) or a decimal dot (and possibly a comma), you'll have to strip that out of the string prior to converting it to a number. Easiest way would be to create some function for that (which could return a "number" value as well). Alternatively you could just (temporary) add another data section to your report with just that data in it (that's the way I use for such problems).

P.S.: Attaching some screenshot as MS-Word (.docx) document is not best practice ... MS-Word documents are an easy vehicle for malware (that's why I usually hesitate to d/l them), and they simply wrap unneeded data around the image (not much, I know). I'd recommend to save the screenshot as JPG, PNG or even GIF and attach that.

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