来自评论的信息：
执行选择操作：

%SelectInit(JOURNAL_ID, PROJECT_ID, JOURNAL_DATE, BUSINESS_UNIT_PC,
 LASTUPDOPRID, DTTM_STAMP) 
SELECT A.JOURNAL_ID, A.PROJECT_ID, A.JOURNAL_DATE, A.BUSINESS_UNIT_PC,
 %OperatorId, %CurrentDateTimeIn 
FROM PS_JRNL_LN A 
WHERE A.PROJECT_ID<> ' ' AND A.BUSINESS_UNIT_PC=' ' 
 AND A.JOURNAL_DATE BETWEEN %Bind(START_DATE) AND %Bind(END_DATE)

SQL操作

UPDATE PS_JRNL_LN A 
SET A.BUSINESS_UNIT_PC = A.BUSINESS_UNIT,
 A.PROCESS_INSTANCE=%Bind(DCP_RUN_UPD_AET.PROCESS_INSTANCE) 
WHERE A.PROJECT_ID <> ' ' AND A.BUSINESS_UNIT_PC=' ' 
 AND A.JOURNAL_ID = %Bind(DCP_RUN_UPD_AET.JOURNAL_ID)
 AND A.JOURNAL_DATE =%Bind(DCP_RUN_UPD_AET.JOURNAL_DATE)

问题是Do Select动作是一个循环，会对每一列执行后续的SQL动作，而您的select陈述式不会传回不同的列，因为并未使用所有的索引键。您可以更新select陈述式，指定所有的索引键。
更简单的解决方案可能是完全删除Do Select操作，并将SQL操作更新为以下内容：

UPDATE PS_JRNL_LN A 
SET A.BUSINESS_UNIT_PC = A.BUSINESS_UNIT,
 A.PROCESS_INSTANCE=%Bind(DCP_RUN_UPD_AET.PROCESS_INSTANCE) 
WHERE A.PROJECT_ID <> ' ' AND A.BUSINESS_UNIT_PC=' ' 
 AND A.JOURNAL_DATE BETWEEN %Bind(START_DATE) AND %Bind(END_DATE)