调用 REUSE_ALV_GRID_DISPLAY 时崩溃 "Field symbol has not yet been assigned"

Question

在显示 ALV 时，我在执行程序时收到崩溃报告。为了创建 ALV，我遵循了一些教程和资料，目前它看起来像这样：

TYPE-POOLS: slis. 
*build field catalog
DATA: it_fieldcat TYPE slis_t_fieldcat_alv,
    wa_fieldcat TYPE slis_fieldcat_alv,
    repid TYPE sy-repid.

REFRESH it_fieldcat.
CLEAR wa_fieldcat.
wa_fieldcat-reptext_ddic = 'Table ID'.
wa_fieldcat-fieldname    = 'table_id'.
wa_fieldcat-tabname      = 'lt_where_used_data_of_coll'.
wa_fieldcat-outputlen    = '18'.
APPEND wa_fieldcat TO it_fieldcat.

CLEAR wa_fieldcat.
wa_fieldcat-reptext_ddic = 'Table Description'.
wa_fieldcat-fieldname    = 'table_description'.
wa_fieldcat-tabname      = 'lt_where_used_data_of_coll'.
wa_fieldcat-outputlen    = '40'.
APPEND wa_fieldcat TO it_fieldcat.

CLEAR wa_fieldcat.
wa_fieldcat-reptext_ddic = 'Numer of Records Found'.
wa_fieldcat-fieldname    = 'nr_of_records'.
wa_fieldcat-tabname      = 'lt_where_used_data_of_coll'.
wa_fieldcat-outputlen    = '30'.
APPEND wa_fieldcat TO it_fieldcat.

*pass data and field catalog to ALV function module
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
  i_callback_program      = repid
  it_fieldcat             = it_fieldcat
  i_structure_name        = 'lty_where_used_data_of_coll'
TABLES
  t_outtab                = lt_where_used_data_of_coll.

'lt_where_used_data_of_coll' 是我的本地 table ，我已经在我的程序的前面填充了一个工作函数。此功能有效，我已经对其进行了测试，并且 table 会自动填充数据。我的下一步是向最终用户显示这些数据。我在执行这个程序时收到的错误报告是：

短文本： Field symbol has not yet been assigned.

发生了什么事？:

Error in the ABAP Application Program.
    The current ABAP program "SAPLSLVC" had to be terminated because it has
    come across a statement that unfortunately cannot be executed.

错误分析：

You attempted to access an unassigned field symbol
(data segment "-1").

运行时错误的触发位置:

    Program                                 SAPLSLVC
    Include                                 LSLVCF36
    Row                                     3,273
    Module type                             (FORM)
    Module Name                             FILL_DATA_TABLE

我真的不知道如何开始寻找我的错误。从 ABAP 本身调用函数时，它似乎运行不正常。

非常感谢任何帮助。

编辑： 正如所建议的那样，我实现了另一种显示 ALV 的方法，可以在下面找到。这种方式工作正常并且没有错误。问题仍然存在，为什么旧方法确实给我一个错误。

我将上面的整个代码块替换为：

DATA alv TYPE REF TO cl_salv_table. DATA message TYPE REF TO cx_salv_msg.

*initialize ALV
TRY.
  cl_salv_table=>factory(
    IMPORTING
      r_salv_table = alv
    CHANGING
      t_table      = lt_where_used_data_of_coll ).
CATCH cx_salv_msg INTO message.
  " error handling
ENDTRY.
*display ALV
alv->display( ).

Answer 1

why the older method does give me an error

字段目录名称区分大小写。将每个 fieldname 和 tabname 值大写并查看错误是否仍然存在。还要确保名称与您内部的名称匹配 table lt_where_used_data_of_coll

调用 REUSE_ALV_GRID_DISPLAY 时崩溃 "Field symbol has not yet been assigned"

Crash "Field symbol has not yet been assigned" when calling REUSE_ALV_GRID_DISPLAY

abap

alv