背景：某天组内的同学发现有个B程序异常退出导致有些表没更新，最终发现是在A程序里sumbit B程序，然后B程序里有个指针没些CHECK <FS_TABLE> IS ASSIGNED导致报了GETWA_NOT_ASSIGNED。
心血来潮找了下相关资料。share给大家

1. Try catch

想在B程序里直接try catch cx_root。想法很简单，既然是异常，我直接catch你根结点总没问题了吧。不出意料打脸了，try catch cx_root里dump了。下面是2个程序，有兴趣的同学可以自己试一下。

*&---------------------------------------------------------------------*
*& Report YDEMO7
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*
REPORT YDEMO7.


PERFORM FRM_SUBMIT.

*&---------------------------------------------------------------------*
*& Form FRM_SUBMIT
*&---------------------------------------------------------------------*
*& text
*&---------------------------------------------------------------------*
*& -->  p1        text
*& <--  p2        text
*&---------------------------------------------------------------------*
FORM frm_submit .
  FIELD-SYMBOLS:<FS_TABLE> TYPE ANY TABLE.
  DATA:LV_EX_MSG TYPE STRING.

  TRY.
    LOOP AT <FS_TABLE> ASSIGNING FIELD-SYMBOL(<FS_TABLE_WA>).

    ENDLOOP.
  CATCH CX_ROOT INTO DATA(CX_ROOT_WA).
    LV_EX_MSG = CX_ROOT_WA->get_longtext( ).
  ENDTRY.

ENDFORM.

*&---------------------------------------------------------------------*
*& Report YDEMO8
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*
REPORT YDEMO8.

  PERFORM FRM_SUBMIT IN PROGRAM ('YDEMO7') IF FOUND.

2. CATCH SYSTEM-EXCEPTIONS

想试试CATCH SYSTEM-EXCEPTIONS的威力，好吧，和Try catch一个德兴。代码不做太多重复

3. 异步RFC

既然你不是想在B程序里更新表嘛，我把B程序单独拿出来做个异步RFC。这样主程序A不会受到影响，A程序里该跟新的表正常更新了。问题又来了，A程序是没问题了，但是B程序该dump还是dump了。好像问题只解决了一半。
最终找了下SAP标准的CX_ROOT类，发现好像确实没有指针的异常类。

总结：对于上述问题的，如果是指针类的该**CHECK <FS_TABLE> IS ASSIGNED.**还是得check,try catch 没招。但是对于其他的异常，try catch还是起作用的。比如下面这个非常常见的除零try catch就很好使了~

*&---------------------------------------------------------------------*
*& Report YDEMO7
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*
REPORT YDEMO7.


PERFORM FRM_SUBMIT.


*&---------------------------------------------------------------------*
*& Form FRM_SUBMIT
*&---------------------------------------------------------------------*
*& text
*&---------------------------------------------------------------------*
*& -->  p1        text
*& <--  p2        text
*&---------------------------------------------------------------------*
FORM frm_submit .
  FIELD-SYMBOLS:<FS_TABLE> TYPE ANY TABLE.
  DATA:LV_EX_MSG TYPE STRING.
  DATA:LV_SREULT TYPE STRING.

  TRY.
    LV_SREULT = 1 / 0.
  CATCH CX_ROOT INTO DATA(CX_ROOT_WA).
    LV_EX_MSG = CX_ROOT_WA->get_longtext( ).
  ENDTRY.

ENDFORM.

*&---------------------------------------------------------------------*
*& Report YDEMO8
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*
REPORT YDEMO8.

PERFORM FRM_SUBMIT IN PROGRAM ('YDEMO7') IF FOUND.