Cannot Edit Sales Invoices during approval

Each Sales Invoice type has it's own configuration. From the available fields, to the type of invoice (credit or invoice) it posts as in Financials.
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Along with this configuration each Sales Invoice type will have it's own Approval Process and Approval Stages.
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Each Approval Stage also has it's own configuration settings.
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One of these settings is the Allow Edit option.
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This needs to be ticked on the Sales Invoice type, and Approval Stage(s) for each part of the process you would like to be able to Edit the record, during approval.
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As at the time of writing (17th April 2020) there is no access within FinOps, or Financials, to change these settings.
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Until this changes; our support team will need to investigate, run scripts or liaise with the hosting or development teams. Any Issues with contacting us, please see the following Get support in Financial Operations.