Project Operations should support the localization of the decimal and thousands separator key (typically a period or comma character) when entering numeric values in fields. On most non-US keyboards, using the "." or "," as a thousandths or decimal separator from the keyboard's numeric keypad doesn't result in the correct separator in PO. For example, a value of 123,456 got entered as 123.456.

The decimal separator should match the region specified in the Personalization Settings (tab Formats). Similar to working in Excel, the output of the decimal separator key is consistent across fields of any data type.

This issue already has been solved in Business Central 09/08/2022 and it should do the same in PO: https://learn.microsoft.com/en-us/dynamics365-release-plan/2021wave2/smb/dynamics365-business-central/support-localized-decimal-separator-numeric-keypads