Hi Bruce,
As I had already checked the first part of your suggestion I went on to the second part. I checked the batch status and added the columns as you said and noticed that the sub-ledger batches in question did indeed have YES under auto-reversing, however there were some batches to retrieve and so we did but those are saying NO under auto-reversing.

The client claims to only have retrieved the batches checked them then post, same procedure they always do however this issue has just started it occured once in October nothing in November and now in December nothing in January.

We could not replicate the issue.