How to use REJECT DUPLICATES

I already found out the so hidden and undocumented property "TSMSSubmit.RD".

But, dispite PDUSpy shows the generated PDU with "REJECT DUPLICATES : YES" tag, it doesnt work. I guess I´m missing pass the MSG REFERENCE NR. : 0 (0x00), but this one I could not find.

Could anyone help?

Thanks in advance,

Dino/Brazil