Hello Benjamin,

Generally when we edit a row in expandable row, the parent row would still display the data and changes as per changes made in the expanded row. 

However a new item would not have any data in the parent row and would display as empty. 

There is no specific mechanism to identify an edited item or a new row as such in my knowledge. 

Hope that helps. 

If the items are persisted separate from the Case, look for pzInsKey or pxCommitDataTime; if it is a pagelist, hook a transform into the post-update mechanism to stamp pxUpdateDateTime, then check that field.