AI723 Problem in Connection of active type analog sensor (current)

Hi Sumit! Nice to meet you! I have a problem when connecting an active type analog sensor (current) in an AI723 channel, as described in the 2PAA103858R0201_M&I_AC700F manual, page 6-20. When I make that connection, the measurement is incorrect (it changes abruptly). The only way I could stabilize the measurement of the signal was using a galvanic isolator between the signal and the channel input. As you could imagine, it wasn't a nice solution from client's point of view. Is it a known issue? is there some way to connecting it without an galvanic isolator?