RCM input credit in GSTR 3B return

I am facing a certain problem while taking RCM input credit in Eligible ITC table of GSTR-3B return . Whenever we supply goods to our client we take the services of a transporter for despatching the consignment  . But the transporter is unregistered. While filing the GSTR-3B return for any particular month we always pay the RCM liability also, figures of RCM liability are seperately shown in Table 3 of the reurn.  But in the same month when we mention these RCM figures in the given field under Table 4 ie Eligible ITC table , then the table is highlighted automatically in red indicating mismatch/deviation.  My question is :  shall I not claim ITC on this RCM  ? As I have already mentioned, every month while generating challan and paying GST liability at the moment of return filing , the RCM liability is also considered.