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I have a small problem with visual flow. I try to execute callout in flow through @InvocableMethod but before this callout, I do update a record(standard update action in Visual flow not in apex code(update)), and I got issues:

"You have uncommitted work pending. Please commit or rollback before calling out"

Yes I know that I can not execute DML before callout but I try to perform my DML(update) in subflow and then execute callout and I got issues too and when trying callout transfer to subflow I got issues too.

  1. Can you explain why?
  2. Flow and subflow is it different transaction?

Thanks.

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The solution to this (and best practice for all invocable apex that does callouts is to do the callout in either an @future or Queueable). This way

  • The DML done by the flow (or subflow) + invocable invocation occurs in transaction 1
  • The callout is done in transaction 2
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Subflows are executed in the same transaction.
To create a new transaction and complete the dml work before the callout, insert a screen or pause node.
The pause node can be configured to resume 0 hours from the current time if you need the flow to continue without human interaction.

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