代码如下：具体说明参见红色说明(本例子是从订单明细提取两个字段的数据到内表)
REPORT ZALV_EDIT.
TYPE-POOLS: SLIS.
*- Fieldcatalog
DATA: IT_FIELDCAT TYPE LVC_T_FCAT.
DATA: X_FIELDCAT TYPE LVC_S_FCAT.
DATA: X_LAYOUT TYPE LVC_S_LAYO.
"第1步：用操作具体单元的是否可编辑的内表和工作区
DATA: LS_EDIT TYPE LVC_S_STYL,
LT_EDIT TYPE LVC_T_STYL.
"第2步：在内表定义添加字段，用于控制具体行的具体单元是否可编辑
DATA: BEGIN OF IT_VBAP OCCURS 0,
VBELN LIKE VBAP-VBELN,
POSNR LIKE VBAP-POSNR,
STYLE TYPE LVC_T_STYL, "FOR DISABLE
END OF IT_VBAP.
DATA: LS_OUTTAB LIKE LINE OF IT_VBAP.
SELECT VBELN POSNR
UP TO 100 ROWS
INTO CORRESPONDING FIELDS OF TABLE IT_VBAP
FROM VBAP.
DATA:L_POS TYPE I VALUE 1.
CLEAR: L_POS.
L_POS = L_POS + 1.
X_FIELDCAT-SELTEXT = 'VBELN'.
X_FIELDCAT-FIELDNAME = 'VBELN'.
X_FIELDCAT-TABNAME = 'ITAB'.
X_FIELDCAT-COL_POS = L_POS.
X_FIELDCAT-EDIT = 'X'.
X_FIELDCAT-OUTPUTLEN = '10'.
x_fieldcat-ref_field = 'VBELN'.
x_fieldcat-ref_table = 'VBAK'.
APPEND X_FIELDCAT TO IT_FIELDCAT.
CLEAR X_FIELDCAT.
L_POS = L_POS + 1.
X_FIELDCAT-SELTEXT = 'POSNR'.
X_FIELDCAT-FIELDNAME = 'POSNR'.
X_FIELDCAT-TABNAME = 'ITAB'.
X_FIELDCAT-COL_POS = L_POS.
X_FIELDCAT-EDIT = 'X'.
X_FIELDCAT-OUTPUTLEN = '5'.
APPEND X_FIELDCAT TO IT_FIELDCAT.
CLEAR X_FIELDCAT.
L_POS = L_POS + 1.
"第3步：设置第六行两个单元都不能输入
SY-TABIX = 6.
LS_EDIT-FIELDNAME = 'VBELN'.
LS_EDIT-STYLE = CL_GUI_ALV_GRID=>MC_STYLE_DISABLED.
LS_EDIT-STYLE2 = SPACE.
LS_EDIT-STYLE3 = SPACE.
LS_EDIT-STYLE4 = SPACE.
LS_EDIT-MAXLEN = 10.
INSERT LS_EDIT INTO TABLE LT_EDIT.
LS_EDIT-FIELDNAME = 'POSNR'.
LS_EDIT-STYLE = CL_GUI_ALV_GRID=>MC_STYLE_DISABLED.
LS_EDIT-STYLE2 = SPACE.
LS_EDIT-STYLE3 = SPACE.
LS_EDIT-STYLE4 = SPACE.
LS_EDIT-MAXLEN = 6.
INSERT LS_EDIT INTO TABLE LT_EDIT.
INSERT LINES OF LT_EDIT INTO TABLE LS_OUTTAB-STYLE.
"第4步：将控制数据写到内表
MODIFY IT_VBAP INDEX SY-TABIX FROM LS_OUTTAB TRANSPORTING STYLE .
"设置第10行只有项目不能输入
clear LS_OUTTAB.
refresh LT_EDIT.
LS_EDIT-FIELDNAME = 'POSNR'.
LS_EDIT-STYLE = CL_GUI_ALV_GRID=>MC_STYLE_DISABLED.
LS_EDIT-STYLE2 = SPACE.
LS_EDIT-STYLE3 = SPACE.
LS_EDIT-STYLE4 = SPACE.
LS_EDIT-MAXLEN = 6.
INSERT LS_EDIT INTO TABLE LT_EDIT.
INSERT LINES OF LT_EDIT INTO TABLE LS_OUTTAB-STYLE.
SY-TABIX = 10.
"将控制数据写到内表
MODIFY IT_VBAP INDEX SY-TABIX FROM LS_OUTTAB TRANSPORTING STYLE .
"第5步：设置控制字段
X_LAYOUT-STYLEFNAME = 'STYLE'.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'
EXPORTING
I_CALLBACK_PROGRAM = SY-REPID
IS_LAYOUT_LVC = X_LAYOUT
IT_FIELDCAT_LVC = IT_FIELDCAT
TABLES
T_OUTTAB = IT_VBAP[]
EXCEPTIONS
PROGRAM_ERROR = 1
OTHERS = 2.
IF SY-SUBRC NE 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
source url：https://www.sdn.sap.com/irj/sdn/wiki?path=/display/Snippets/Disable+or+Enable+Input+fields+Conditionally+In+ALV
