diff --git a/openbis/source/sql/postgresql/076/function-076.sql b/openbis/source/sql/postgresql/076/function-076.sql
index 5580577c49b3fde425b9d29bbd5377b55977562d..ebca1a7d7432143328f03e032f08542ff68a935b 100644
--- a/openbis/source/sql/postgresql/076/function-076.sql
+++ b/openbis/source/sql/postgresql/076/function-076.sql
@@ -352,7 +352,7 @@ BEGIN
 	  FROM data
 	  WHERE data.samp_id = NEW.id AND data.del_id IS NULL;
 	IF (counter > 0) THEN
-	  RAISE EXCEPTION 'Sample (Code: %) deletion failed because at least one of its data sets is not deleted.', NEW.code;
+	  RAISE EXCEPTION 'Sample (Code: %) deletion failed because at least one of its data sets was not deleted.', NEW.code;
 	END IF;
   -- all components need to be deleted
 	SELECT count(*) INTO counter 
diff --git a/openbis/source/sql/postgresql/077/function-077.sql b/openbis/source/sql/postgresql/077/function-077.sql
index 5580577c49b3fde425b9d29bbd5377b55977562d..ebca1a7d7432143328f03e032f08542ff68a935b 100644
--- a/openbis/source/sql/postgresql/077/function-077.sql
+++ b/openbis/source/sql/postgresql/077/function-077.sql
@@ -352,7 +352,7 @@ BEGIN
 	  FROM data
 	  WHERE data.samp_id = NEW.id AND data.del_id IS NULL;
 	IF (counter > 0) THEN
-	  RAISE EXCEPTION 'Sample (Code: %) deletion failed because at least one of its data sets is not deleted.', NEW.code;
+	  RAISE EXCEPTION 'Sample (Code: %) deletion failed because at least one of its data sets was not deleted.', NEW.code;
 	END IF;
   -- all components need to be deleted
 	SELECT count(*) INTO counter 
diff --git a/openbis/source/sql/postgresql/migration/migration-075-076.sql b/openbis/source/sql/postgresql/migration/migration-075-076.sql
index 86ee1ba0e3ffc5cef4c55b5791bbe59df2eca6e8..745cc5b7edadf77511c09d0e4c6a6d24fb24a470 100644
--- a/openbis/source/sql/postgresql/migration/migration-075-076.sql
+++ b/openbis/source/sql/postgresql/migration/migration-075-076.sql
@@ -119,14 +119,14 @@ BEGIN
 	  FROM data
 	  WHERE data.expe_id = NEW.id AND data.del_id IS NULL;
 	IF (counter > 0) THEN
-	  RAISE EXCEPTION 'Experiment (Code: %) deletion failed because at least one of its data sets is not deleted.', NEW.code;
+	  RAISE EXCEPTION 'Experiment (Code: %) deletion failed because at least one of its data sets was not deleted.', NEW.code;
 	END IF;
 	-- check samples
 	SELECT count(*) INTO counter 
 	  FROM samples 
 	  WHERE samples.expe_id = NEW.id AND samples.del_id IS NULL;
 	IF (counter > 0) THEN
-	  RAISE EXCEPTION 'Experiment (Code: %) deletion failed because at least one of its samples is not deleted.', NEW.code;
+	  RAISE EXCEPTION 'Experiment (Code: %) deletion failed because at least one of its samples was not deleted.', NEW.code;
 	END IF;
 	RETURN NEW;
 END;