Problem with Format Masks and Computations

(I did a quick search on this, but didn't notice another thread on the topic. If there is already one I apologize.)
We are using APEX version 2.2.1.00.04.
I had an editable item that had the 999G990D00 format mask. In a computation I used that item and another item (that didn't have a format mask) to calculate a third item. The item I was trying to compute would not populate. It really had me stumped, so I went so far as to completely delete the fields and re-construct everything. When I did so the computation worked. That is until I put the format mask on the item again. I removed the format mask and the computation now works.
Is this a known issue? Is it a bug? Am I doing something wrong?
Thanks, Tony

Tony,
As Patrick mentioned, all variables in Apex are strings. Whenever you do something with them that effectively requires something other than a string value the database does an implicit type conversion. This often works, but not in cases where the db doesn't know how to do the conversion. For example, if your default database date format is dd-mon-yyyy and you have a string 10/09/2007 the database won't have any idea how to convert it to a date. That same is true for number formats.
In your case, you used the number format mask in apex to convert a number to a string witht the given format. Apex does not do anything to convert it back to a number when you submit the page (unless you use the built in row processing). If you want to do anything with it as a number, you need to change it back with the to_number function. The second parameter is the format mask of the string you are passing in.
Hope this helps,
Anton

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