You mean you want to create to fields in your report to display uniquely or are you expecting to do more with this (counts, sums0 etc.)
If not just place the {LX.LX_TYPE} field on your canvas twice and conditionally suppress each on opposite of each other
first one to only display "S"
Right click on it and select Format field
select Common Tab
click on formula next to Suppress
add your formula
{LX.LX_TYPE}= "R"
Save and close
Repeat for the other but swap the formula to {LX.LX_TYPE}="S"