Allow for UI Extensions in order to add custom buttons e.g. to an Invoice View where a workflow can be startet. Example: On the invoice Object in the UI I can can add a button "Start Workflow XYZ" and when this button is clicked it starts a call on the workflow with some context information (such as Invoice Id) as Workflow parameters. In particular we need this in order to regenerate the Invoice correctly if a payment is applied or a credit memo. There is no automatic event for that.
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