Hi Srini,
Please check if availability check is activated in the application (T-code BF11).
Since you say that the availability check is not working, I assume that you mean that the requirement type is not getting determined in the sales order-procurement tab. There are two ways in which the requirement type is determined in the sales order:
(1) Item category-MRP type combination. The path is IMG-Sales & Distribution-basic functions-availability check and transfer of requirements-determination of transaction types using transaction
(2) Through the strategy group in the MRP3 view of the material master.
Also, please check if the availability check field (material master-MRP3) has the correct value. It needs to have the correct checking group value.
The combination of checking group and checking rule is used to carry out control for availability check (T-code: OVZ9). This is an extremely important setting.
Basically, carry out the following checks:
* Availability check field in the material master-MRP3 tab
* Checking rule- if it is correctly determined in the sales order
* OVZ9 settings
Please do let me know if this helps.
Regards,
Sumita Mittra