SAP ALV报表导出本地文件报错：GETWA_NOT_ASSIGNED 解决办法

SAP 报表导出本地文件时报错：

报错文档如下：

Runtime Errors GETWA_NOT_ASSIGNED
Date and Time 2020-10-15 14:59:42

Short text
Field symbol has not yet been assigned.

发生了什么?
Error in the ABAP Application Program

The current ABAP program "SAPLKKBL" had to be terminated because it has
come across a statement that unfortunately cannot be executed.
Note down which actions and inputs caused the error.

To process the problem further, contact you SAP system
administrator.

Using Transaction ST22 for ABAP Dump Analysis, you can look
at and manage termination messages, and you can also
keep them for a long time.

错误分析
You attempted to access an unassigned field symbol
(data segment 136).

This error may occur if
- You address a typed field symbol before it has been set with
ASSIGN
- You address a field symbol that pointed to the line of an
internal table that was deleted
- You address a field symbol that was previously reset using
UNASSIGN or that pointed to a local field that no
longer exists
- You address a global function interface, although the
respective function module is not active - that is, is
not in the list of active calls. The list of active calls
can be taken from this short dump.

经查：有两个原因

1. ALV显示超过了99列，不被支持。
2. ALV字段名错误，定义输出ALV的字段名跟内表定义的字段名不一致。(Fieldcat-fieldname 赋值的时候是小写字母)

我这里的情况是第一种，使用部门导出的是xls格式的Excel文件

 

 然后我用 MHTML 格式导出，发现可以，一百多列也可以导出

问题解决，升级office，导出时选择 Excel（MHTML格式）即可！可以另存为.xlsx格式！。 

我的Office版本是：MS Office 2016专业版