Me imagino has confirmado que los objetos que has elegido para "replicar" estan soportados por Logical Standby?

1) Verificar objetos NO soportados:

SELECT DISTINCT OWNER,TABLE_NAME

FROM DBA_LOGSTDBY_UNSUPPORTED

ORDER BY OWNER,TABLE_NAME;

2) Para asegurar la unicidad de las filas (si encuentras BAD_COLUMN = N entonces deberias revisar esas tables o habilitar "Supplemental Logging")

SELECT OWNER, TABLE_NAME,BAD_COLUMN FROM DBA_LOGSTDBY_NOT_UNIQUE

WHERE TABLE_NAME NOT IN (SELECT TABLE_NAME FROM DBA_LOGSTDBY_UNSUPPORTED);

3) Supplemental logging esta habilitado:

SELECT SUPPLEMENTAL_LOG_DATA_PK, SUPPLEMENTAL_LOG_DATA_UI FROM V$DATABASE;