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Often times, you need to force a particular type of input to a SalesLogix field. There are a couple ways to do this: If the control is mapped to an numeric database field, an error will be displayed stating that alpha characters are not allowed; otherwise, you can set the format type of the control to ftInteger, but that will not prevent alpha entry. It will only prevent any non-numeric values from being displayed (any non-numeric value would display as '0').
The method I use frequently, is to evaluate the key pressed in the control, and set the control to readonly based on what is being entered...
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