=IIF Query

I am trying to us this in an update Access query =IIF(LEN( [PRWBBEPI]![FILE #] =3,"000"& [PRWBBEPI]![FILE #] ,IIF(LEN( [PRWBBEPI]![FILE #] =4,"00"& [PRWBBEPI]![FILE #] ,
It keeps telling me wrong # of arguments Can anyone see where I went wrong
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Kelvin SparksCommented:
Try this

=IIF(LEN( [PRWBBEPI]![FILE #]) =3,"000"& [PRWBBEPI]![FILE #] ,IIF(LEN( [PRWBBEPI]![FILE #]) =4,"00"& [PRWBBEPI]![FILE #] ,

You can also use String function and get expected result without IIF:
=String(6-Len([PRWBBEPI]![FILE #]),"0") & [PRWBBEPI]![FILE #]

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Serena2345Author Commented:
great thanks
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