1）增加或删除前导0
"增加前导0
DATA: ls_matnr TYPE matnr VALUE '15000042'.
DATA(ls_in_matnr) = |{ ls_matnr ALPHA = IN }|.
WRITE: ls_in_matnr. "示例结果：000000000015000042
"删除前导0
DATA: gs_matnr TYPE matnr VALUE '000000000015000042'.
DATA(gs_out_matnr) = |{ gs_matnr ALPHA = OUT }|.
WRITE:/ gs_out_matnr. "示例结果：15000042
