Problem in ALV Grid..( F4 help button )

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Hi,

I am using ALV Grid. and am building field catalog as follows.

But in my grid, am not getting F4 help button for certain fields (say:'PROJN_NET', 'DISPO_NET').

I could not make out why the button is not appearing. Please help me out.

FYR: some piece of code:

DATA : wfcat_net TYPE LINE OF lvc_t_fcat.

CLEAR wfcat_net.

CLEAR list_fcat_net.

CLEAR wfcat_net.

wfcat_net-edit = ''.

wfcat_net-fieldname = 'AUFNR_NET'.

wfcat_net-col_pos = 1.

wfcat_net-ref_field = 'AUFNR'.

wfcat_net-ref_table = 'AUFK'.

APPEND wfcat_net TO list_fcat_net.

CLEAR wfcat_net.

wfcat_net-fieldname = 'PROJN_NET'.

wfcat_net-edit = ''.

wfcat_net-col_pos = 3.

wfcat_net-f4availabl = 'X'.

APPEND wfcat_net TO list_fcat_net.

CLEAR wfcat_net.

wfcat_net-fieldname = 'KDAUF_NET'.

wfcat_net-edit = ''.

wfcat_net-col_pos = 4.

wfcat_net-ref_field = 'KDAUF'.

wfcat_net-ref_table = 'AUFK'.

APPEND wfcat_net TO list_fcat_net.

CLEAR wfcat_net.

wfcat_net-fieldname = 'DISPO_NET'.

wfcat_net-edit = 'X'.

wfcat_net-col_pos = 6.

wfcat_net-f4availabl = 'X'.

wfcat_net-ref_field = 'DISPO'.

wfcat_net-ref_table = 'AFKO'.

APPEND wfcat_net TO list_fcat_net.