Link Between FI and PS

HI,

I have a problem when I try to get some FI documents starting my SELECT with PROJ Table, at the end I sould find BSEG-PRCTR field

I tried to read

(1) PROJ-PSPNR = PRPS-PSPHI

(2) PRPS-PSPNR = BSEG-PROJ

But it did not work ,, after that I tried with  Func. CONVERSION_EXIT_KONPD_OUTPUT and CONVERSION_EXIT_ABPSP_OUTPUT but it did not work too

Can anybody help me for solving my problem

Thanks