diff --git a/sas/sasjs/services/hooks/mpe_tables_postedit.sas b/sas/sasjs/services/hooks/mpe_tables_postedit.sas
index d5dbe27..6a9c754 100644
--- a/sas/sasjs/services/hooks/mpe_tables_postedit.sas
+++ b/sas/sasjs/services/hooks/mpe_tables_postedit.sas
@@ -23,8 +23,11 @@
 /* ensure uppercasing */
 data work.staging_ds;
   set work.staging_ds;
-  LIBREF=upcase(LIBREF);
-  DSN=upcase(DSN);
+  /* PK fields should not be upcased if we are trying to delete records */
+  if upcase(_____DELETE__THIS__RECORD_____) ne "YES" then do;
+    LIBREF=upcase(LIBREF);
+    DSN=upcase(DSN);
+  end;
   loadtype=upcase(loadtype);
   buskey=upcase(buskey);
   var_txfrom=upcase(var_txfrom);