When you change checking group to KP, no availability check is carried out which is why you aoid the error when you make that change; No check is maintained for the checking group in OVZ2.
MMBE is not a suitable transaction to check availability. You need to use CO09. For example, you may have 5 in stock, but this 5 may be confirmed to a sales order (i.e it is promised to this order), therefore leaving 0 available. However, you still have 5 in stock which is what MMBE will show.
For deliveries, checking rule B is usually used so enter CO09 with Material / Plant / B.
SAP Note 89362 explains why you should use CO09, and not MMBE in more detail.
Edited by: Noel Connolly on Feb 10, 2012 11:29 AM
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