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I make an order with availability check 01 in MMR, a dialog box opens which shows me delivery proposal, complete delivery and scope of check. When I press scope of check the link is between checking rule A and availability check 01. My question is why does the system took the combination of checking rule A and availability check 01 and why not checking rule 01 and availability check 01. What prompted the system to take the combination of A and 01,inspite of not defining checking rule A anywhere in the MMR. Is this predefined in the coding? Availability check is carried out in different transactions like Sales order creation, delivery creation, Purchase order creation, goods issue and also in production order. The point to be noted here is everywhere the availability check is carried out using two basic elements. 1. Checking rule 2. Checking group Now let us understand these two important elements. Checking Rule Checking rule is transaction based, i.e. In STD SAP system, if you are creating the sales order, then it is A, if delivery then it is B, if you are creating/releasing production order, then it is PP. This is almost fixed. What is the use of this as a single element it does not have any meaning, but with checking group. Checking group Checking group is the one what you assign in material master at plant level, i.e. for different plant and for the same material or for same plant different material there can be a different checking group. This is assigned in material master in MRP3 view, as a signal element it may not have much meaning except that it may be used for checking at which level - group level or individual level and quantities confirmed in the availability check are to be locked or not. Combination of Checking rule and checking group will define the scope of check In scope of check you will be defining all control parameters in t-code OVZ9 Checking group you have defined in MMR as 01 and system is checking with checking rule A as it is a sales order you have created Hence the system takes the said combination Checking rules are predefined in SAP. Checking Rule A for Sale Order and B for Delivery is pre defined in SAP and based on the availability check what you maintain in material master, checking rule will react in sale order. 'A' refers to Sales Order and Availability check Rule determined in '01'.
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