Updating list items fed by repeating table

[JamesJHarrison]

I have a Nintex repeating table in a form that I need written to another list.  I have been able to successfully write the contents of the repeating table to a list following the below post (Query XML and then do for each loop and collection operation to extract one value at a time, and then at the conclusion of each for each loop I create a new list item):

https://community.nintex.com/t5/Nintex-for-SharePoint/parse-xml-to-sharepoint-list/td-p/47503 

However, now that I have this working, I need the ability to support updates to the repeating table and I need these updates to update the separate list items.  My create item action saves the list item ID to a variable, but not sure how to write this back to a list item ID field I have in the repeating table.  Also not sure how to make it so that updates to the repeating table update the list.

I assume this topic has been covered by now, but haven't been able to find it.  Would appreciate being pointed in the right direction.  Thanks.

[SimonMuntz]

Hi.
As you know the repeating section is stored as XML.
To write the Item ID variable back to the xml you would use the Update XML action.

[JamesJHarrison]

Thanks, I created a field in my repeating table called ListID and figured out how to populate it with the UpdateXML, but every time I tried to use that field to update the list, it wouldn't let me save it in a variable of type List Item ID.  Ran into so many roadblocks, I just built a workflow to delete all list items and then rewrite them all every time the XML data changes.  Are there any existing posts that provide step-by-step instructions of how to update the list items the repeating section writes to every time it changes?  I wasn't able to find any if they exist.