Using field K as an example and substituting your table and field names for mine, does this example work as a conditional format expression?
Max ( PortalTable::K ) = Self
Note, "Max ( PortalTable::K ) might need to be put into a calculation field in your layout's table before you get the right value to use in your conditional format, but if my first suggestion works, you've avoided the need to add a calculation field.
Perfect - as usual your advice is spot on! If possible can you explain how the "self" component makes it work. I had tried the max part but it needed your addition of the self part.
"self" is a place holder that, when used in a conditional format expression, refers to the value of the object selected for this conditional format without explicitly naming it. Since only a field or a variable can hold a value, self will work in this context only with a field, and possibly a variable--though I haven't tried it in that context.
Self can also be used in auto-entered calculations in this same manner.