Document type number ranges

T.code : OBA7

standard SAP has give some of the Document type generally any sap consultant uses those standard SAP document type until unless if client asked for the new document.

you can create new document type by selecting the new entries ....

some of general document types

Customer payment terms

Path : SPRO-Financial accounting –>AR and AP –>Business transactions->Incoming invoices / Credit memos –> Maintain terms of payment 

Select new entries tab

Payment terms                     : it is 4 digit code 

Select customer check box

Define Screen Layout per Company Code(Vendor) in SAP

To control the certain field while creation of vendor master data

it control the field like suppress, required entry , optional entry and display

T.code ; OB24

Creation of Vendor Account Group in SAP

In your organization you may have several vendor if you want to make them some group for easy reporting purpose like Business Area wise , product wise , Material wise ...etc....

for that we need have account groups in SAP