Hi Vamsi,
The data is not always stored the same way as entered on the screen. It undergoes some conversions due to the conversion routines in the Domain level of the fields. ( Have a look at KUNRE ).
Use:
" conversion_exit_alpha_output " FM to convert the data from 00000012345 to 12345.
and " conversion_exit_alpha_input " FM for vice-versa.
Hope this helps you.