MRRL enhancement is not work

Hi , all

When use MRRL to exeute IR , the IR posted date is system date .

I want to assign new posted date , so I use enhancement MRMH0001 to assign new Posted Date .

but 'it's not work .

My step is

1. SMOD

2. enhancement : MRMH0001

3. EXIT_SAPLMRMH_001

4. write small pices of code like this

I_RBKPV-BUDAT = SY-DATUM - 10 .
I_RBKPV-BLDAT = SY-DATUM - 10 .
MOVE-CORRESPONDING I_RBKPV TO E_RBKPV_ERS_CHANGE .
E_CHANGE = 'X'.

But it is no work , the IR date still is system date .

somebody know how to solved this problem ...