Fix problem altering system trigger. Thanks Pavel Zotov.

Author: asfernandes

src/include/firebird/impl/msg/dyn.h

@@ -306,8 +306,8 @@ FB_IMPL_MSG_SYMBOL(DYN, 313, dyn_dup_package, "Package @1 already exists")
 FB_IMPL_MSG(DYN, 314, dyn_index_schema_must_match_table, -901, "42", "000", "Index schema (@1) must match table schema (@2)")
 FB_IMPL_MSG(DYN, 315, dyn_trig_schema_must_match_table, -901, "42", "000", "Trigger schema (@1) must match table schema (@2)")
 FB_IMPL_MSG_SYMBOL(DYN, 316, dyn_dup_schema, "Schema @1 already exists")
-FB_IMPL_MSG(DYN, 317, dyn_cannot_mod_system_schema, -607, "HY", "000", "Cannot ALTER or DROP SYSTEM schema")
+FB_IMPL_MSG(DYN, 317, dyn_cannot_mod_system_schema, -607, "28", "000", "Cannot ALTER or DROP SYSTEM schema")
 FB_IMPL_MSG(DYN, 318, dyn_cannot_drop_non_emptyschema, -607, "HY", "000", "Cannot DROP schema @1 because it has objects")
-FB_IMPL_MSG(DYN, 319, dyn_cannot_mod_obj_sys_schema, -607, "HY", "000", "Cannot CREATE/ALTER/DROP @1 in SYSTEM schema")
+FB_IMPL_MSG(DYN, 319, dyn_cannot_mod_obj_sys_schema, -607, "28", "000", "Cannot CREATE/ALTER/DROP @1 in SYSTEM schema")
 FB_IMPL_MSG(DYN, 320, dyn_cannot_create_reserved_schema, -607, "HY", "000", "Schema name @1 is reserved and cannot be created")
 FB_IMPL_MSG(DYN, 321, dyn_cannot_infer_schema, -901, "42", "000", "Cannot infer schema name as there is no valid schema in the search path")

src/jrd/obj.h

@@ -218,6 +218,8 @@ inline const char* getObjectName(ObjectType objType)
 	{
 		case obj_relation:
 			return "TABLE";
+		case obj_trigger:
+			return "TRIGGER";
 		case obj_package_header:
 			return "PACKAGE";
 		case obj_procedure: