I am having trouble in AMS Designer with the error:

ncelab: *E,CUVDNF (./ihnl/my_lib/my_cell/schematic/verilog.vams,123|30): Could not determine discipline for this expression .

In spectre, I run my my simulation consisting of a mixture of spectre and Veriloga files with no difficulties.  However, when I switch the simulator to AMS, I get this error.  I looked at one other thread, that hypothesized this error to occur with veriloga discipline voltage vs electrical, but the answer was inconclusive.  I also seem to get it with other disciplines like logic.

I have tried changing the order of the hierarchy editor 'view list', and switched up the default connect rules, to no avail.

Does anyone have any guidance on how to avoid this error?  Is it a connect rules issue?

Thanks,
Makelo

The error goes away by changing all type Voltage I/Os to type Electrical.  

Not the ideal fix, as I believe the type Electrical increases the information being tracked by the simulator which slows the simulation.  

I have checked that the issue exists with both IUS6.2, IUS8.2 and with connect libs, ConnRules_5V_full, ConnRules_18_full.  Are there other connect rules that should be used with type Voltage?