Use of Commas in Correspondence files

In making my correspondence file, I see how to add prefix and suffix elements to a value  - For example, If i want to print

-200 = 98%

where 98 is the value and -200 and % are the prefix and suffix respectively. (It is bolded here just to highlight what i want to print)

My correspondence element looks like this

<<HasData(<<TEST_RESULTS.M200>>,-#200 = <<TEST_RESULTS.M200>>%)>>

Works fine and gives this formatted output 

-200 = 98%

What I want to do is print something like this:

PP= , -200 = 98%

How do I specify that comma??, I can get the PP =, to print but can't seem to get that desired comma to print. I tried putting it in direct - no joy, I tried "," no joy, tried "","" still no joy.

For example:

<<HasData(<<TEST_RESULTS.M200>>,PP = , -#200 = <<TEST_RESULTS.M200>>%)>>

My result is  simply

PP =

It "breaks" on that comma delimiter, thinking it is a control character instead of a literal? Looks like the comma by itself is reserved for code control.

Advice???