Vendor payment Error : Locale needs to be specified. Parameter names: _locale

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Posted on by Sophs@4Sight

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We have a customer that has recently been getting this error " Locale needs to be specified. Parameter names: _locale".

This error occurs when trying to navigate to

Accounts payable > Payments > Vendor payment journal / Lines Payment proposal / Edit invoices for selected payment

I have verified the user options and both the Language and Date, time, and number format have the en-US value.

I debugged the code and found the exact spot where the error originates. This is standard code and not customised

On form CustVendPaymProposalEditForm.newLedgerJournalTrans) line 2149: PreferredLocale locale = new xSession().preferredLocale();

new xSession().preferredLocale() returns with a null value.

I have tried changing the user options after reading More options to personalize the date and time format - Dynamics 365 Finance and Operations - Dynamicspedia.

to see if it will default to Language field for the Regional settings, by

We have tried with a number of different users. The only user that we can get to work is the Admin user on the dev box , it returns with en_US. As I can't debug into the code xSession().preferredLocale() I am not sure if there is a setting that might be missed.

Is there any other settings that might need to be checked. How can I determine what the Language field is for the regional settings.

Any advice will be appreciated

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Microsoft Dynamics AX

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Diego Mancassola 752 on at

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Hello, check if the user is listed on Invalid User form on System Administrator.

The issue can occurs when user’s email alias is mismatch between Azure AD and Dynamics 365, check it.

In the past a fight with an error where the dates are in US format but the settings was IT, and the problem is that misalign between Entra and FO

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CU27011421-0 62 on at

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This error usually means the system is not resolving a valid user/session locale, even if user options look correct.

Things to check:

User options (important)
Go to User options → Preferences
Ensure Language is explicitly set (not blank)
Also verify date/time/number format matches the language
System administration → Users
Check the user record has a valid Language assigned
Try reassigning (e.g., en-us) and re-login
Browser / session issue
Clear cache or try InPrivate
Sometimes locale isn’t passed correctly in session
Batch / service account
If this runs via batch, check the batch user’s language
This is a common miss
Code clue you found
Since xSession::preferredLocale() is returning null, it confirms the session isn’t picking up a language → so it’s config/session, not business logic.
Quick test
Login as another working user
Compare user options + roles

If admin works but others don’t, it’s almost always a user-level language or session context issue, not customization.

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Sophs@4Sight 263 on at

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Hi Diego

Thank you for your prompt response. Following your feedback, We ended up deleting the user and then importing them again and this solved the error.

Thank you so much

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