PgPool - black_function_list problem

Hello,

I have a problem with black_function_list which seems to work badly
2 nodes PgSql 9.6.10 in hot_standby mode + Pgpool 3.7.5

primary : wal_level = hot_standby
standby : hot_standby = on
pgpool.conf :
load_balance_mode = on
ignore_leading_white_space = on
white_function_list = ''
black_function_list = 'curval,lastval,nextval,setval,
copy_order_item.*,val_aurora_schema.copy_order_item.*,WITH
ins_parent_order_item AS.*'

But error on slave node :

< 2018-09-12 14:59:33.901 CEST >>ERROR: cannot execute SELECT in a
read-only transaction
< 2018-09-12 14:59:33.901 CEST >CONTEXT: SQL statement "WITH
ins_parent_order_item AS (
INSERT INTO val_aurora_schema.order_item
SELECT (oi).* -- note the parentheses
FROM (
SELECT t #= hstore('id', uuid_generate_v4()::text)
#= hstore('item_ident', uuid_generate_v4()::text)
#= hstore('item_type', p_new_order_item_type::text)
#= hstore('parent_ident', v_new_parent_ident::text)
#= hstore('item_version', p_new_item_version::text)
#= hstore('subitem_number', p_new_subitem::text)
AS oi
FROM val_aurora_schema.order_item t
WHERE id = p_old_order_item_id
) sub
RETURNING id
)
select id from ins_parent_order_item"
PL/pgSQL function
val_aurora_schema.copy_order_item(integer,character varying,character
varying,boolean,boolean,integer) line 84 at SQL statement
< 2018-09-12 14:59:33.901 CEST >STATEMENT: select * from
val_aurora_schema.copy_order_item($1,$2,$3,$4,$5,$6,$7) as result

I tried to put /*NO load balance*/ before the "WITH ins_xxx" statement, but
still the same problem.

Can someone help me ?

Thanks

Frédéric BOULET
boulet(dot)f(at)gmail(dot)com