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SAP中的补零函数：
前导零补充：
LOOP AT lt_matnr INTO ls_matnr.
"补0函数IF ls_matnr-low IS NOT INITIAL.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
EXPORTING
input = ls_matnr-low
IMPORTING
output = ls_matnr-low.
ENDIF.
ENDLOOP.
去除前导零：
LOOP AT lt_matnr INTO ls_matnr.
"补0函数IF ls_matnr-low IS NOT INITIAL.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
EXPORTING
input = ls_matnr-low
IMPORTING
output = ls_matnr-low.
ENDIF.
ENDLOOP.