Help - iplot pentable and Reference Files

I have a pentable that will do what I want using print/plot. However,
iplot will not accept this type of pentable (code not recoginized). So
I am writing a new pentable to work with iplot.

I reference the file to its self (with specific logical name).
The purpose is so that all yellow items in the master file, when
plotted, display as highlighted items. So i have it set up that it
ignores all elements in the reference file that is not yellow and plots
only yellow items 1st at a heavy weight (wt=8). then the yellow items
in the master file plot next as a light weight and black.

My problem is that I cant figure out the code to ideinify the reference
file. everything else works fine. either the yellow plots all yellow
or all black not both.
Below is a portion of the pentable i am having problems with...
------------------------------------------------
IF (TYPE .in. 5, 66) THEN
IF (COLOR .NE. 4) THEN ! ignore reference white
IGNORE_ELEMENT = .TRUE.
ELSE IF (color .EQ. 4) THEN
PRIORITY = 1 ! reference highlight yellow heavy
COLOR = 4
WEIGHT = 8
ENDIF

if (color .eq. 4) then ! master file yellow to black
priority = 50
color = 0
weight = 3