“Activation:13007 - No unique keys or primary key for object id nnn” encountered during activation. (4301841)

The following messages are encountered during activation:
Warning  2021-01-20 10:02:59.825000 1736 1724 Activation: 13007 - No unique keys or primary key for object id 25210  (activating sid SID1) [module osp]
 

These messages are to highlight that a table in replication has no primary or unique key and may result in Post performance issues.
Performance issues may also be encountered in other SharePlex processes (Read) since SharePlex has to use all columns as keys.
If it is possible, then create an index on the Source table.
Depending on whether the operation is a supported DDL, it will either be replicated by SharePlex right away or during future activation when such DDL changes will be replicated.