diff --git a/src/common/pl/plpgsql/src/gram.y b/src/common/pl/plpgsql/src/gram.y
index 0183dfc3d..1ee23aff6 100755
--- a/src/common/pl/plpgsql/src/gram.y
+++ b/src/common/pl/plpgsql/src/gram.y
@@ -7249,7 +7249,9 @@ make_callfunc_stmt(const char *sqlstart, int location, bool is_assign, bool eate
             InsertErrorMessage(message, plpgsql_yylloc);
             ereport(errstate,
             (errcode(ERRCODE_DUPLICATE_FUNCTION),
-             errmsg("function \"%s\" isn't exclusive ", sqlstart)));
+             errmsg("function \"%s\" isn't exclusive ", sqlstart),
+             errdetail("The overload function must be package function or function with PACKAGE keyword.And do not mix overload functions of O style and PG style."),
+             errcause("The overload function must be package function.")));
         }
     }
 
diff --git a/src/test/regress/expected/out_param_func_overload.out b/src/test/regress/expected/out_param_func_overload.out
index dd1512266..a74eef8cf 100644
--- a/src/test/regress/expected/out_param_func_overload.out
+++ b/src/test/regress/expected/out_param_func_overload.out
@@ -327,6 +327,14 @@ drop view v1;
 drop package pac_test_1;
 NOTICE:  drop cascades to function out_param_func_overload.f_test_1(integer,integer,integer)
 drop table t1;
+create or replace procedure proc_test is
+begin
+perform count(1);
+end;
+/
+ERROR:  function "count" isn't exclusive 
+DETAIL:  The overload function must be package function or function with PACKAGE keyword.And do not mix overload functions of O style and PG style.
+CONTEXT:  compilation of PL/pgSQL function "proc_test" near line 1
 --clean
 reset behavior_compat_options;
 drop schema out_param_func_overload cascade;
diff --git a/src/test/regress/sql/out_param_func_overload.sql b/src/test/regress/sql/out_param_func_overload.sql
index 1710d96db..4e3796d57 100644
--- a/src/test/regress/sql/out_param_func_overload.sql
+++ b/src/test/regress/sql/out_param_func_overload.sql
@@ -262,6 +262,11 @@ drop view v1;
 drop package pac_test_1;
 drop table t1;
 
+create or replace procedure proc_test is
+begin
+perform count(1);
+end;
+/
 
 --clean
 reset behavior_compat_options;