How to soft delete a row from the target table?

Could someone help me on this requirement?
How to implement the below logic using only ODI? I am able to implement the below logic with the "DELETE_FLAG" as "N".
I want to make the latest record with the flag as "N" and all the previous other records with the flag as "D".
Thanks a lot in advance.
I have a source table "EMP".
EMP
EMPID FIRST_NAME
1 A
2 B
First name is changed from A to C and then, C to D etc. For each data change, I would add a target row and mark the latest row as "N" and the rest as "D". The target table would contain the following data:
Target_EMP
EMPID FIRST_NAME DELETE_FLAG
1 A D
1 C D
1 D N

The problem is that I can't delete the row cause it demands from me to fill the mandatory field previously. It takes place when the key field is ROWID. In other cases delete is succesful.

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How to soft delete a row from the target table?

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