@RA899 - Jarmo, as always, is correct :). A workaround for this is to split the column by testing temperature and apply limits to the new columns. You can use Manage Limits to bulk edit the limits. If you have a lot of columns, create a separate data table that contains the variable, LSL, Target, USL.
p.s. Last year I lead an effort where we taught 50+ engineers how to do this so we could do a corporation wide capability study. The method worked well. I too wish a column could support multiple spec limits.