Ans1. First of all Billing document is never deleted, But 
Cancelled. One can cancel billing document by VF11.

Ans2. We can transfer stock from one plant to another plant 
by movement type 301.
movement type 301 (TF tfr. plant to plant) or a 302 TR 
(reverse plant to plant). 
303 is TF from storage to plant 
305 is TF plant in storage in plant 

From storage location to storage location.
311 Transfer posting storage location to storage location 
in one step 

The quantity is transferred from unrestricted-use stock of 
the issuing storage location to unrestricted use in the 
receiving storage location. 
Possible special stock indicators: 
E, K, M, Q 
See also 321, 343, 349, and 455 for other stock types 

313 Stock transfer storage location to storage location in 
two steps - removal from storage 

The quantity is transferred from unrestricted-use stock of 
the issuing storage location to stock in transfer in the 
receiving storage location. 
Possible special stock indicators: 
None 

315 Transfer posting storage location to storage location 
in two steps - placement in storage 

In the receiving storage location, the quantity is 
transferred from the stock in transfer to the unrestricted-
use stock. 
Possible special stock indicators: 
None 

Ans.3. BOM is bill of materials. Bill of Material is an 
complete list of components that make up a finished 
manufactured product. The Bill of material consists of the 
item number of each component, quantity required in the 
manufacture of a component and the unit of measure of the 
item. Such individual components which make up a 
manufactured product has a specific name in SAP. They are 
called Bill of Material Items BOM items. SAP R/3 allows 
creation of various categories of BOM Bill of Material. 
Some of the categories of BOM include, document BOM, 
material BOM, equipment BOM, Sales Order BOM and Functional 
location BOM.
In SALES:- 
A bill of material (BOM) describes the different components 
that together create a product. A BOM for a bicycle, for 
example, consists of all the parts that make up the 
bicycle: the frame, the saddle, wheels, and so on. 

Process Flow 
When you enter the material number of a bill of materials 
that is relevant for sales order processing, the system 
displays the material that describes the whole bill of 
materials as a main item. The individual components are 
displayed as lower-level items. 

There are two ways to process a bill of materials in Sales. 
Once you have entered a bill of material in a sales order, 
the system runs pricing, inventory control, and delivery 
processing at: 

- Main item level if the material is assembled, or  
- Component level if the material is not assembled 

The type of processing used by the system is determined by 
the item category group that you enter in the material 
master record for relevant materials. 
  

Processing at Main Item Level  
If you want the system to carry out pricing, inventory 
control, and delivery processing at main item level, enter 
ERLA in the Item category group field of the Sales: sales 
org. 2 screen in the material master record of the finished 
product. This means that the components only function as 
text items and are not relevant for delivery. The following 
graphic shows how a bill of material is processed at main 
item level. 
  

Processing at Component Level 
If you want the system to carry out pricing, inventory 
control, and delivery processing at the component level, 
enter LUMF in the Item category group field of the Sales: 
sales org. 2 screen in the material master record of the 
finished product. In this case, only the components are 
relevant for delivery. During processing the system 
automatically creates a delivery group. The latest delivery 
date among all the components becomes the delivery date for 
the entire delivery group.