Leading Zero w/ variable field length...

I'm creating a form in which I need a particular field to:
- Accept/Display a leading zero (or multiple leading zeros);
- Accept numbers numbers;
- Have a maximum field length of six numerals, but with the ability to accept fewer;
- Display an error message if the above criteria are not met.
I have some code (see below), but don't know how to make the field length variable.
var fmt = /^\d\d\d\d\d\d$/;
if(event.value != "")
if(!fmt.test(event.value))
app.alert("Incorrect format, field must contain numbers only.");
event.rc = false;
Make sense...? Can anyone help...?
Thank you.

This drops the leading zero(s) and does not display the error message.
Adjustments...?
Thank you for your promp reply.

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You can use Function Module <b>'CONVERSION_EXIT_MATN1_OUTPUT'</b>
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Bcoz MATNR in VBAP itself have Conversion routine.
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tables:
vbap.
data:
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from vbap
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loop at t_vbap into vbap.
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Hi there,,
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how can i avoid leading zeros for a field in smartform?

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Actually the field length is 16.
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Leading Zero w/ variable field length...

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