Good explanation from PegaAcademy UI course:

Default Locale Setting

On the record’s Profile tab, the Localization section contains the Default locale field. We can associate an initial locale with this operator that affects the processing and presentation of dates, times, and numbers.

Enter a locale code for the desired locale. The standard codes in the format aa_BB_CC, where aa represents the language and _BB or _BB_CC represents a country variant suffix. For example, it_IT is the locale for Italian as spoken in Italy, de_DE is German as spoken in Germany, and de_CH is Swiss German.

For example, enter de_DE to use the German display mode for dates (DD.MM.YY) rather than the American mode ( MM/DD/YY).

If the Internet Options locale setting for a user's workstation applies to the localized application, leave this field blank. If we enter a value in this field that is the same locale as the language-specific rulesets that a user can access, the user can work with an entire localized application regardless of the workstation locale.

Thanks Kevin. I went through the help as well. We are facing with the CheckSubstituteForOperator, if we select the locale as th_TH the assignment is routed to work group manager , else it is routing to current user work list. In the assignment we are using ToWorkList and gave the parameters as CurrentOperatorId and checked the CHECKOperatorAvailability check box.

If I remove the locale,  its working. If i Include its processing like operator is not available and routing the assignment to work group manager.

So I was wondering how the locale is related to CheckOperatorAvailability while routing to work list.

Thanks,

Suman

Raised an  SR-A21343  for the issue.

Thanks,
Suman