no data found in OE_ORDER_HEADERS

i am login using APPS.

select * from dba_synonyms where synonym_name in ('OE_ORDER_HEADERS','OE_ORDER_HEADERS_ALL') and owner='APPS';

                                        

OWNER	SYNONYM_NAME	TABLE_OWNER	TABLE_NAME	DB_LINK
APPS	OE_ORDER_HEADERS	ONT	OE_ORDER_HEADERS_ALL
APPS	OE_ORDER_HEADERS_ALL	ONT	OE_ORDER_HEADERS_ALL

select * from apps.oe_order_headers;

no data found.

select * from apps.oe_order_headers_all;

a lot of records.

what's wrong? how to check why the apps.oe_order_headers is not working?