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Error: "Critical System Error System.FormatException Input string was not in a correct format"

This support note applies to:

  • AO Practice Manager (NZ)

  • AO Practice Manager (AU)

  • AE Practice Manager (NZ)

  • AE Practice Manager (AU)

Article ID: 28958

If you have incorrectly set negative number formats in Windows, you may get a few different errors in MYOB Practice Manager. For example:

  • Critical System Error
    System.FormatException
    Input string was not in a correct format.
    This error occurs when adding a credit note or a negative miscellaneous charge, such as a discount or practice write off.

  • ForeignKeyConstraints Detail requires the child key values (-12) to exist in the parent table.
    This error occurs when adding or editing timesheets.

  • There was an unexpected problem loading workpaper Review Points
    This error occurs when opening a workpaper.

Set the Negative Number Format

  1. In Windows, open Control Panel and, depending on your version and layout, click either:

    • Region

    • Clock and Region > Region

    • Clock, Language and Region > Region

    • Region and Language.

  2. Click Additional settings.

  3. If the Negative sign symbol field isn’t set to - (a hyphen), change it to - and click Apply.

  4. From the Negative number format drop-down, choose -1.1.

  5. Click OK. The changes are saved.

  6. Close and re-open MYOB AE/AO.