What the purpose of using sales order type?

In VOV8 of sales docunment like OR, what is the functionalities of those options?

FUNCTIONALITY OF A SALES DOCUMENT TYPE:

i) Document category: 
Specifies a classification for different types of document that we can process in sales and distribution system. The document category determine how the system stores, keeps track of document data. Ex: A-Inquiry, B-Quotation, C-order

ii) Sales document block: 
Specifies whether a sales document is blocked for processing. Note: If a sales doc type is blocked the user cannot create new sales document of that type, but sales doc already created before setting the block can be changed or displayed.

iii) Number range internal assignment and number range external assignment:
Specifies the number ranges with the help of which either the system (if it is internal) or the user (if it is external) can give a number for the sales doc.  Defining number ranges for sales document:
 
SPRO
Sales and distribution
Sales 
Sales documents
Sales document header
Define number ranges for sales document.
 
iv) Item number increment: 
Specifies the value by which the item number are incremented in sales document “when the system automatically generate item number”

v) Sub item increment: 
Specifies how the sub-item number will be incremented in the sales document.                                                                                   
Note: If we do not specify any value here the sub-item number increment as the main item.      

i) Reference mandatory: 
Specifies whether a reference document is mandatory to create a sales document if so the indicator also specifies which type of document should be used as reference.

vii) Item division: 
If we check this field the division ate item level in the sales document will be determined from corresponding material master record, otherwise the division entered at Header level applies for all the items in the sales document.

viii) Check division: Specifies whether and how the system reacts if the divisions at the item level differs from the division at header level during sales document processing
Ex: we can block some divisions for a customers.

ix)  Read info record: 
If we check this field then only the system considers customer material info record.

x) Check PO number: 
Specifies whether the system checks if the PO number exists for other sales document.

xi) Check credit limit: Specifies whether the system carries out credit limit check for the customers during sales document processing.

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