Number ranges are created at client level. If you want a particular number range to work for you, then that number range has to be assigned to your vendor account group created for your company code.
To assign number ranges to vendor account group;
Path: Financial Accounting > Account Receivable and Accounts Payable > Vendor Accounts > Master Records > Preparations for creating vendor master records > Assign number ranges to vendor account groups
T Code: OBAS
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