A question about R3ta_hint.txt in table splitting

HI, all

I am doing a system copy of NW7.4SR2. According to the system copy guide,

“With the file R3ta_hints.txt, you can instruct R3ta to use specific columns of a table to create a WHERE condition.”

But after step "Table splitting prepare" in SWPM, I found no .WHR file in the export directory or installation directory. I am wondering whether theR3ta_hints.txt works or not.

Thank you

Jack