I get an error when mapping segment name to PIPELINE-REFERENCE in PCF translator

I'm importing PCF files generated in Plant 3D, and trying to associate the line number with the segment.

I first tried to add a custom attribute of MISC-SPEC1 to the PCF file using Plant 3D's iso.atr ("MISC-SPEC1 LDT.PipeTag"). I believe this doesn't work because custom attributes are added to the PCF header, not to the segment.

Next I updated the pcfin.map file to associate LINENUMBER to PIPELINE-REFERENCE using a wiki entry. This works properly, but the translator no longer maps materials correctly. I get an error on every single component:

Translator version 1.0.0.88

pcfIn.map changes:

[SETTINGS]
    LINENUMBER PIPELINE-REFERENCE