I am using the new IU with the Nets cash card.
No problem with the ERP so far.
And yes, I encountered parking problem in a couple of carparks, HDB hub is the recent one. Can go in without any issue. But when going to exit, it encountered error. End up have to slot the cash card into the machine. But when I went back to HDB hub some days later, no problem using the same card at the same exit.