经过查阅资料原来是资源不足的问题：
原来是sap在并行运行时资源不足，执行了一半资源不足时直接中断了
然后还是查询资料，看到国外的已经有解决方案了（不多说，我就是搬运了代码）
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loop at lt_itab.
* try to initialize parallel process
do.
* check if there is enough process in the system ( sm50)
* refer to https://www.sapalles.com/2014/06/10/abap-parallel-processing-2-strategy/
call function Z_CHECK_RESOURCES
* if there is enough DIA process
if lv_free_wp GT 0.
call
funtion 'Z_PARALLEL_PROCESS'
starting new task
exceptions
resource
_failure = 1
others = 2.
* no resource problem ,then exit do and iterate in itab
if sy-subrc eq 0. <code></code>
exit.
endif.
endif.
waint
until lv_value eq 'X'.
enddo.
endloop.
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22:这是检查资源的功能。 Z_CHECK_RESOURCES
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function z_check_resources.
*"----------------------------------------------------------------------
*"*"Local Interface:
*" IMPORTING
*" REFERENCE(I_GROUP) TYPE RZLLI_APCL
*" REFERENCE(I_SAFE_PERCENT) TYPE I DEFAULT 75
*" EXPORTING
*" REFERENCE(E_FREE_WP) TYPE I
*"----------------------------------------------------------------------
data lt_applserver type table of rzlli_asvr with header line .
data lv_applserver type msname2 .
data lv_safe type i .
data lv_dia_wps type i.
data lv_free_dia_wps type i .
data lv_total type i .
data lv_free type i .
select applserver from rzllitab
into table lt_applserver
where classname eq i_group.
loop at lt_applserver .
lv_applserver = lt_applserver.
clear lv_dia_wps.
clear lv_free_dia_wps .
call function 'TH_COUNT_WPS'
exporting
server = lv_applserver
importing
dia_wps = lv_dia_wps
free_dia_wps = lv_free_dia_wps
exceptions
failed = 1
others = 2.
if sy-subrc eq 0.
lv_total = lv_dia_wps + lv_total .
lv_free = lv_free_dia_wps + lv_free.
endif.
endloop.
lv_safe = ( lv_total * i_safe_percent ) / 100.
if lv_free gt lv_safe .
e_free_wp = lv_free.
else.
e_free_wp = 0 .
endif.
endfunction.
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https://www.sapalles.com/2014/02/03/abap-parallel-processing-1/
https://www.sapalles.com/2014/06/10/abap-parallel-processing-2-strategy/
记录一下，国内网站没有找到的解决方案