Is “Parallel run” supported today, in particular regarding double work?

Running old and new systems side by side for a short time to compare totals. Plan for: double work; different rounding; staff confusion. In the catalog it is a plan and nothing is built.

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The tag above says how real the answer is. Answers describe the plan in the repository and design documents. No app is released. Where an answer touches tax or law, treat it as a theme to verify with a qualified local adviser.

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