Hi,
Please check following configurations :
a. IMG --> Financial Accounting (New) --> Accounts Receivable and Accounts Payable --> Vendor Accounts --> Master Data --> Preparations for Creating Vendor Master Data --> Define Account Groups with Screen Layout (Vendors) (OBD3)
b. IMG --> Financial Accounting (New) --> Accounts Receivable and Accounts Payable --> Vendor Accounts --> Master Data --> Preparations for Creating Vendor Master Data --> Define Screen Layout per Activity (Vendors) (OB23)
In this check for each and every activity what has been given except Display. Wherever it is Display make it Required or Optional as per your requirement in all options except Display Vendor (Accounting), Display vendor (Purchasing) and Display vendor (centrally).
I hope your doubts are cleared if nit feel free to revert.
Regards,
Tejas