Hello Anusha,
Any Sales order changes is posted to COPA for Record type A is updated by new Data. It always reverse the original document and post the new document with changes. In this case the changes are made and result is credit hold that means it will reverse the COPA original data and will not post any data as there is no new data.when there is credit hold the old orders status changes to not processed so it will not update the value in COPA.
i hope it clarifies
Best Regards
Hrusikesh