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Please Enter A Valid Tax Registration Number

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Posted on by kantim

Hi,

Recently we have seen clients with this error Please Enter A Valid Tax Registration Number in Dynamics GP 18.7 as there has no changes in Dynamics GP, anyone else encountered same error?

Your input is appreciated.

Regards,

Kanti

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Microsoft Dynamics GP

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kantim 9 on at

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Please Enter A Valid Tax Registration Number

Hi Daniele\Brandon,

Apologies for not getting back to you sooner.

I have followed as instructed, still having issue, we have a support ticket open with Microsoft to investigate as it had been working until now.

Thanks for your help so far.

Kind regards

Kanti

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DAnny3211 11,255 on at

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Please Enter A Valid Tax Registration Number

Hi,

This message usually appears when VAT Daybook is enabled and the system validates the Tax Registration Number for companies, vendors, or customers where the country code is GB (or other VAT‑specific regions). Even if nothing changed in GP 18.7, the validation logic enforces these rules:

The Tax Registration Number cannot be blank if the country code is GB and VAT Daybook is active.

The number must be entered without letters or spaces. For example, if your VAT number is GB 999 9999 73, enter it as 999999973.[1]

Steps to resolve:

Check Company Setup and Vendor/Customer Options

Go to Tools ▸ Setup ▸ Company ▸ Company (or Debtor/Creditor Maintenance Options) and verify the Tax Registration Number field. Enter the number in numeric format only.

If the field should remain blank

Temporarily clear the country code (e.g., GB), close the Options window, then re‑enter the country code and save.

Or disable VAT Daybook if you’re not using it: Tools ▸ Setup ▸ System ▸ Use VAT Daybook and unmark the checkbox for the company.[1]

If the error persists

Test with the sa login to rule out user security corruption. If the issue is user‑specific, copy their security to a new user ID and retest.[1]

If this helps resolve the issue, please confirm on the thread so others can benefit.

Thanks and best regards,

Daniele

Note: This response was prepared with support from Copilot to ensure clarity and completeness.

References

[1] "Please enter a valid tax registration number." in Creditor or Debtor ...

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BJ-09051414-0 328 on at

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Please Enter A Valid Tax Registration Number

Hey Kantim,

Thank you for your response!

As the tax Registration is defined, if you are using multiple companies, can you verify that this defined in all companies. There was a new feature added some time ago that allowed for Group Filing.

Couple things to look at:

"Please enter a valid tax registration number." in Creditor or Debtor Maintenance Options window or Company Setup Options window in Microsoft Dynamics GP - Microsoft Support

And

Microsoft Dynamics GP: 'Making Tax Digital' functionality for UK VAT Question 10. Remove and re-enter the value. Be sure no spaces.

Make sure your Country Codes are correct for your Vendors and Customers.

• Verify that all your Debtors and Creditors have a COUNTRY CODE on their Debtor/Creditor Maintenance window. (Cards | Purchasing | Debtor or Cards | Sales | Creditor). The Debtor/Creditor will be skipped if the country code is missing. (Consider creating smartlists on the 'PM Vendor Master File' [PM00200] and/or 'RM Customer Master' [RM00101] tables for the front-end user to review.) The Country Code is now a required field in order to have the debtor/creditors tax transactions pull on to the VAT Return. (NOTE: Country codes are NOT required for VAT Daybook.)

select * from PM00200 where CCode = '' and VENDSTTS <> 2

select * from RM00101 where CCode = '' and INACTIVE = 0

I hope this helps!

Thank you!

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kantim 9 on at

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Please Enter A Valid Tax Registration Number

Hi Brandon,

Thanks for your response.

This error in VAT Return trying to retrieve dates for the vat return calculation, and get this error. We checked the Tax registration number in company setup, this had not been changed.

I hope this help.

Kind regards,

Kanti

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BJ-09051414-0 328 on at

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Please Enter A Valid Tax Registration Number

Hey Kantim,

I have not heard of this occurring for clients.

Can you provide more information?

What are the users doing when this occurs?

What module is this message occurring in?

Do they have any third parties that require the Tax Registration?

If yes, does disabling the third party stop it from occurring? (For testing only to help determine the cause. Not a solution).

Is it happening to all users?

Is there anything in common with the clients that are reporting this?

Is the client using VAT?

If yes, is the Tax Registration Number defined in the Company Setup Option window?

"Please enter a valid tax registration number." in Creditor or Debtor Maintenance Options window or Company Setup Options window in Microsoft Dynamics GP - Microsoft Support

I hope this helps!

Thank you!

Brandon

Enavate

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