【转】去掉前导零
（1）shift
SHIT ITAB-FIELD LEFT DELETING LEADING ‘0’。
(2)function
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去掉前面0
*&--------------------------------------------------------------------*
*& Form frm_alpha_output 去零
*&--------------------------------------------------------------------*
call function 'CONVERSION_EXIT_ALPHA_OUTPUT'
exporting
input = &1
importing
output = &1.
---------------------------------------------------
前面加0
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call function 'CONVERSION_EXIT_ALPHA_INPUT'
exporting
input = &1
importing
output = &1.
去掉前面0
*&--------------------------------------------------------------------*
*& Form frm_alpha_output 去零
*&--------------------------------------------------------------------*
call function 'CONVERSION_EXIT_ALPHA_OUTPUT'
exporting
input = &1
importing
output = &1.
---------------------------------------------------
前面加0
---------------------------------------------------
call function 'CONVERSION_EXIT_ALPHA_INPUT'
exporting
input = &1
importing
output = &1.