I assume you are saving to a Salesforce datasource.  These order of operation things work in different ways based on the data source. 

Here’s how order of operations on Salesforce works.

• We group up all transactions (inserts, updates, deletes) on a per model basis, processing everything one model at a time


• For each model being processed, transactions are processed and committed in the following order: All Inserts, All Updates, All Deletes


• Rollbacks occur for any single transaction that fails, unless the “Rollback on any error” option is checked