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 negative number formats are incorrectly set in Windows, you may see the following error when adding a credit note/ a negative miscellaneous charge such as a discount or practice write off in MYOB Practice Manager.

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

How to set the Negative Number Format

In Windows, open Control Panel.
Go to Clock, Language and Region > Region or Region and Language.
Click Additional settings. The Customize Format window appears.
From the Negative number format drop-down list, choose -1.1.
Click OK. The changes are saved.