TREX 7.0 Compatible with NetWeaver 7.01 ?

Hi Experts,

Currently I have an NW 7 EHP1 ABAP system and a TREX 7.0 system connected using RFC connection. When trying to create indexes in TREX using Enterprise Search, below error occurred:

TREX 7.00 RFC Server Not supported TREX_RFC_SERVIC

It seems to me that TREX 7.0 is not compatible with NW7 EHP 1, can someone please confirm? Because upgrading from TREX 7.0 to 7.1 woud require OS upgrade as well, so if TREX upgrade can be avoided it would be great.

Any idea would be very nice and appreciated.

Thanks

Luis