Tax number error or validation in Business partner

[Swaroop_Nayak]

Hi Team,

There is one requirement that, while creating a Business partner (Supplier), when the user is entering the value in the TAX number field, it should trigger an error or warning that if the TAX number is wrong based on the State code or address.{Eg-While creating a supplier with region Karnataka, the tax code must be 29ABCDE1234F1Z0 for IN3, but if you choose another tax number 33ABCDE1234F1Z0 (tax number of Tamil Nadu) for IN3, it is picking up. It should throw an error.}

Can this feasibility be achieved, or any standard way to set this up?

Regards,

Swaroop Nayak

SAP S/4HANA Cloud Public Edition SAP S/4HANA Cloud Public Edition Sourcing and Procurement MM (Materials Management) 

[thomas201tang]

Implementing cross-field validation to ensure a Business Partner's GSTIN State Code (first two digits of the TAX number) matches the Region/State in their address is not standard SAP functionality. This crucial business requirement must be achieved via a Custom Enhancement, specifically a Business Add-In (BAdI) in the BP master data process. An ABAP developer my ford benefits is required to code the logic to read both fields, compare them, and trigger a mandatory Error or Warning message if they do not correspond, preventing the user from saving the invalid data.

[Daisy_Zhang]

We helped you to accept the answer, since there were no updates after 7 days. You can unaccept it anytime if you have further questions.

[Lakshmipathi · Accepted solution]

The current standard behavior is SAP Public Cloud validates GSTIN format (length, alphanumeric pattern) but does not check if the GSTIN state code matches the supplier’s region or address by default. This means a supplier with Karnataka address can enter a GSTIN starting with 33 (Tamil Nadu) without error.

Below approach you can try

In SAP S/4HANA Public Cloud, you can use Business Configuration (SSCUI) or Custom Fields and Logic (CFL) app. Implement a Validation BAdI such as BusinessPartnerTaxNumberCheck or similar logic in Supplier Master.

Logic:

• Extract first two digits of GSTIN (state code).
• Compare with Region code in BP address (table J_1ISTATECDM for mapping).
• If mismatch → Raise error or warning.

Also check SAP notes 2441042 and 2884058