Do one of the following:
(A) Increase the value of MaxRowHashBlocksPercent to allow more locks per transaction or :
(B) run the following SharePlex command to configure Post to break large transactions into smaller ones to work around the current limit:
sp_ctrl> target r.{target_DB} [queue {post_queue}] set resources commit_frequency={number of operations per transaction}.
See the SharePlex Reference Guide for full syntax details.