Adding Zeros infront of a field in Message Mapping

Hi,

I need to add zeros infront of my target field (eg Target Field length is fixed (10). If incoming field is having only 3 digits (123), I need to add 7 (10-3) zeros infront of my target field (0000000123). How to go about it. Is there any standard functions to do this ?

Thanks in advance,

Jose Augastine