Funds commitment in a PO

Hello,

In EA-PS 600 we activated BAdI FMFR_ALLOW_DOCCATS toreduce funds commitment from purchase orders (ME21N), the document categories allowed are 030 - funds reservation and 050-funds commitment, yet 050 is not accepted in PO , returning the error "RE002 Document & is not a funds reservation"

BAdI's method:

METHOD if_ex_fmfr_allow_doccats~get_allowed_doccats.

  DATA: ls_doccats TYPE LINE OF fmfr_allow_dcat_tt.

  ls_doccats = 030.

  APPEND ls_doccats TO e_t_doccats.

  ls_doccats = 050.

  APPEND ls_doccats TO e_t_doccats.

ENDMETHOD.

Has anyone used this BAdI's to reduce Funds commitments from POs ? without upgrading to  EA-PS 603 or higher where this integration MM-FM exists.

Any advice is appreciated.

Thanks,

Sorina