diff --git a/Semi_ATE/STDF/PRR.py b/Semi_ATE/STDF/PRR.py
index 91f0712..112f2d0 100644
--- a/Semi_ATE/STDF/PRR.py
+++ b/Semi_ATE/STDF/PRR.py
@@ -121,6 +121,8 @@ def to_atdf(self):
             body += "I|"
         elif v != None and v[1] == '1':
             body += "C|"
+        elif v != None and v[0] == '0' and v[1] == '0':
+            body += "|"
 #                              5 PART_FLG bit 2
         if v != None and v[2] == '0':
             body += "|"
@@ -157,4 +159,4 @@ def to_atdf(self):
 
         if self.local_debug: print("%s._to_atdf()\n   '%s'\n" % (self.id, retval))
         return retval
-    
\ No newline at end of file
+