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validation on i/o box

Dear all,

I have one i/o box in module pool pro.,

And user should be allowed to enter ALPHABETs ( A to Z)

but not the NUMBERs ( 0 to 9 ).

For this I defined the field's format as STRG in screen attributes.

But as soon as i execute the Tcode for this module pool , it gives runtime error as CONVERSION_FAILED_ERROR..

Could anybody suggest me the solution...

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Edited by: Marcelo Ramos on Nov 21, 2008 11:48 AM

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