Numbering issue for BP internal (&1) and vendor external (&2)

What causes this issue?

The assignment of BP grouping &v1& to vendor account group &v2& is
usable for the Vendor UI.
The BP grouping refers to an internal number assignment. The vendor
account group refers to an external number assignment. The
<DS:DE.BC_SAMENUMBER>Same Numbers</> flag shall be set.
The issue occurs in the number range Customizing. The number range
interval of the vendor does not match the number range interval of the
business partner.

System Response

The harmonization report
<DS:RE.MDG_BS_SUPPL_HARM>MDG_BS_SUPPL_HARM</> issues an error for these
settings.
Using these settings in the Vendor UI can lead to data inconsistencies.

How to fix this error?

The number range for the vendor account group has to be part of the
number range for the BP grouping.
Check and correct the number range Customizing settings for the BP
grouping under <ZK>SAP Customizing Implementation Guide</> ->
<ZK>Cross-Application Components</> -> <ZK>SAP Business Partner</> ->
<ZK>Business Partner</> -> <ZK>Basic Settings </>-> <ZK>Number Ranges
and Groupings</> -> <DS:SIMG._CABP_BUCF>Define Number Ranges</>.
Check and correct the number range Customizing settings for the vendor
account group under <ZK>SAP Customizing Implementation Guide </>->
<ZK>Financial Accounting</> -> <ZK>Accounts Receivable and Accounts
Payable</> -> <ZK>Vendor Accounts</> -> <ZK>Master Data</> ->
<ZK>Preparations for Creating Vendor Master Data</> ->
<DS:SIMG.SIMG_CFMENUORFBXKN1>Create Number Ranges for Vendor Accounts
</>.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.