Hello,
In case I had a fully understanding about your question, you have an Item with posted entries (Stock Item) and now you want to change it to a Service Item?
If it's case you can't change the Item Type directly, in case there is already posted entries for that Item.
I would recommend you to follow the below procedures:
- Create at Item Journals a negative adjustment to put the Item Stock (Item with wrong Type) as zero;
- Block the Item card to avoid users use that Item in the future;
- Create a new Item card with the right Type and start using this new Item card.
Hope this can help you.