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Before the workflow is invoked, the RPC is set to status "post-pending"'Post-Pending'.
If no post-RPC workflow is invoked, the RPC will be set to status "completed"'Completed', and the rate plan change engine will pick it up and delete it.
If a post-RPC workflow is invoked, this workflow will be responsible for setting the status on the RPC to "completed" 'Completed' when appropriate. This is so the workflow does not have to be in-process and can be run asynchronously
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