Availability check purpose

Question

I want to know the purpose of availability check in material master.(daily requirements,individual requirements etc) .
how does it effect in planning.
which values to be selected in availability check.
Edited by: Csaba Szommer on Jan 6, 2012 8:26 AM

Answer 1

Hi,
u could search threads available on this topics,
Pl. refer following excerts from SAP help.
Availability Check 
Use
During sales order processing, the availability check enables you to tell the customer if the product can be delivered on time. You can control how the availability check is carried out by setting the Availability check field in the material master.
Integration
There are two availability check methods:
u2022     Check against planned independent requirements
o     Used with, for example, strategy 50, 60, 52, 63, 74. (All other strategies use ATP check.)
o     Only planned independent requirements are taken into account
o     No MRP elements (for example, stock) are taken into account
o     No requirement to customize the checking rule
o     The field Availability check is only used to determine the requirements passing (daily or individual requirements)
u2022     Available-to-Promise (ATP) check
o     Check is performed against stock and all other MRP elements (for example, stock, production orders, sales orders, requirements, schedule lines)
o     Option to check against a replenishement lead time (RLT).
o     Very accurate
o     Always performed when production orders are processed.
Activities
Transferring Requirements from Sales Orders
The following applies to both checking methods:
In the standard system, checking group 01 is set up so that daily requirements are passed on to production. This means that there is only one line visible in the stock/requirements list (as shown above) that contains the cumulated quantity for one day, rather than the individual sales orders. The sales order number does not display on the Order line in the stock requirements list.
If you want to see individual requirements, you can create a new checking group in Customizing for Sales and Distribution (choose Basic Functions  Availability Check and Transfer of Requirements  Availability Check  Availability Check with ATP logic or against planning  Define checking group) and a new checking rule that combines the new groups with A.
Set up the ATP Checking Rule for Sales Order Processing
The following applies only to the ATP checking method:
u2022     You can define how the system checks availability of components in production orders in Customizing for Sales and Distribution. Choose Basic Functions  Availability Check and Transfer of Requirements  Availability Check  Availability Check with ATP logic or against planning  Carry out control for availability check.
AV (= Checking group for availability check)     Description     ChR (= Checking rule for availability check)     RLT
01     Daily requirements     A     'Blank' (= check with replenishment lead time)
02     Individual requirements     A      'X' (= check without replenishment lead time)
u2022     The checking rule in the sales order is A in make-to-stock strategies and AE for make-to-order strategies. The checking rules for 01/AE and 02/AE are the same in the standard system.
u2022     You can define your own checking rule for production orders in Customizing. In the standard system,the checking rule for production orders is PP.
Set up the ATP Checking Rule for Production Order Processing
The following applies only to the ATP checking method:
u2022     Maintain the Availability check field on the MRP screen of the material master. In the IMG for Production, choose Production Orders  Operations  Availability check  Define checking group.
u2022     Maintain the checking rule. In the IMG for Production, choose Production Orders  Operations  Availability check  Define checking rule. The checking rule is assigned to the order type and transaction (create/release). In Customizing, choose Production Orders  Operations  Availability check  Define checking control.
u2022     Define the scope of the check. In the IMG for Production, choose Production Orders  Operations  Availability check  Define scope of check.
u2022     Maintain the checking control. In the IMG, choose Production  Production Orders  Operations  Availability check  Define checking control to define a plant and production order type combination and when check availability can be performed, during order creation or during order release.
Regards
Devendra