Vendor Duplicate check messages 144, 145

Dear Team,

I want to understand how to map 144 and 145 messages and how they work.

I gone to OBA5 transaction or SPRO >> Financial Accounting(New)->Accounts Receivable and Accounts Payable->Vendor Accounts->Master Data->Preparations for Creating Vendor Master Data->Change Message Control for Vendor Master Data

I select Online and Batch for " I". I have following points to clarify:

1. Do I need to give this for each individual ID. If I want to give for whole org, how to do.

2. In the last column - standard, when I try to create, no message type came. When I am trying to duplicate vendors, what message will come, whether it is S, E, W, A. For this do we need to do some where else

3. I want to understand what duplicate entries it will check. It will check any particular field or Vendor name. 

Regards,

Sai Krishna