Hi Rahul,
Thank you for your advice.
And both invoices can be seen on the same document flow based on the delivery.
In the table 'VBFA' of the sales have both invoices...
The symptom is just like SAP note#12934.
And I already received support-feedback from SAP via incident case.
But their advice is hard to be accepted.
i) No analyzation for the root cause how the duplicated invoice data could be put into the DB update queue.
ii) And I tested the suggested solution, report program 'ZVINVOIC'.
But it shows even all the normal cases like I/C billing & customer billing and even partial shipment cases.
As you know,
if the report can't classify the above normal cases from the real duplicated invoice case,
it's meaningless to me.
(As I analyzed the source of the report program,
it just prints all the multiple invoices case when a document document flow have multiple invoices regardless it's normal case or not...)