i may be WAY off, it is the 4th Monday of the week and I have not completed a single cup of coffee yet today, so apologies if i totally missed it.
if your report can be changed to add a group on the 'S'/'A' field, you could suppress the details section and display data in the Group Footer 4 (S-A Value Field)
use a formula in the suppressed details to combine your fields and a second one in the GF4 to display them. something sorta like:
//{@Combine}
stringvar sv;
IF {table.SAValueField} = "S" then sv := sv & "/" & {table.RAJAValueField} else sv := sv;
//{@Display)
stringvar sv;
sv
You would still need to place the real table/field names for {table.RAJAValueField} in the RF4 on top of the display formula, and then set suppression criteria for both the database field and the display formula so that only the appropriate one was shown.