Goldengate warning on table with primary key

Installed Goldengate Version 18.1.0.0.0 for Oracle 11gR2. Table has primary key and yet goldengate complains that there is no key found,see below GGSCI (server01.localdomain as gguser@UPGR) 3> add trandata scott.books 2019-01-23 22:44:42 WARNING OGG-06439 No unique key is defined for table BOOKS. All viable columns will be used to represent the key, but may not guarantee uniqueness. KEYCOLS may be used to define the key. 2019-01-23 22:44:42 INFO OGG-15130 No key found for table SCOTT.BOOKS. All viable columns will be logged. 2019-01-23 22:44:42 INFO OGG-15135 TRANDATA for instantiation CSN has been added on table SCOTT.BOOKS` GGSCI (server01.localdomain as gguser@UPGR) 10> info trandata scott.books Logging of supplemental redo log data is enabled for table SCOTT.BOOKS. Columns supplementally logged for table SCOTT.BOOKS: "AUTHOR", "ID", "LANGUAGE_ID", "TITLE", "YEAR_PUBLISHED". Prepared CSN for table SCOTT.BOOKS: 978016 This is DDL of scott.books from Oracle SQL Developer CREATE TABLE "SCOTT"."BOOKS" ("ID" NUMBER(*,0), "TITLE" VARCHAR2(26 BYTE), "AUTHOR" VARCHAR2(23 BYTE), "YEAR_PUBLISHED" NUMBER(*,0), "LANGUAGE_ID" NUMBER(*,0), CONSTRAINT "PK_ID" PRIMARY KEY ("ID") ) Can someone point me in right direction. Thanks From dba_constraints SQL> SELECT 2 constraint_name, 3 constraint_type, 4 status, 5 validated 6 FROM 7 dba_constraints 8 WHERE 9 owner = 'SCOTT' 10 AND table_name = 'BOOKS'; CONSTRAINT_NAME C STATUS VALIDATED ------------------------------ - -------- ------------- PK_ID P ENABLED VALIDATED