Sheets + Flow + Books

Sheets + Flow + Books

I have a Flow looking to updated or created rows in Zoho Sheets. Then it should create an invoice in Books. No matter what I do when testing the flow I get the final error in the Books flow test showing

Zoho Books says "Invalid value passed for bulk_update"

I have even done something as simple as  ROW CREATED OR UPDATED then FETCH ITEM with SEARCH BY - ITEM NAME - ${trigger.ProductService}

The Books Item Name and the ${trigger.ProductService} referenced in Sheets is exactly the same so it should find it.

I tried this with 1 row to limit the data being processed. Still the same error.