Checking rule

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Hi,

When I create the sales order with ZOR and select the display item availability screen, I can able to see the stocks and availability check 02 and check rule A.

Availability check 02 is determined from the material master but how the Checking rule A is determined ?

I have checked OVZ9 there are various combinations are available like with Availability Check 02 with checking rule A is for SD order, B SD delivery for, AE SD order; make to order etcu2026

But if I change the item category from TAN to ZTAN in the sales order (ZOR) then the checking rule is determined as AE the reason is I have copied TAN to ZTAN and marked special stock check in item category ZTAN apart from this all controls are like TAN.

I want to know how the Checking rule is determined.

Edited by: babubala on Nov 16, 2009 8:40 AM