problem with Xilinx

[Stefano Trucco]

Hi,
I have finded following error message in the synthesis process :

Analyzing module <pga>.
ERROR:Xst:853 - Unsupported item in port list for module <LDI_mpx>.

The port list in module pga (reference module) is:

LDI_mpx LDI_mpx ( .LDI (LDI),
.LDI_TxRx (LDI_RX),
.LDI_S (LDI_S),
.go (READY),
.CS0I (CS0I),
.CS2I (CS2I),
.RDI (RDI)
//.WRI (WRI),
//.LW_RI (LW_RI),
//.BUFFER_WR (BUFFER_MPX_LDI)
);

I don't find where is the unsupported item.The module LDI_mpx was
finded correct for synthesis.