Statistics Relevant Delivery Date

the statistic delivery date is used for vendor evaluation. 

if the PO is not transmitted to the vendor, then SAP changes the statistical delivery date along with the delivery date, as at this time the vendor cannot be guilty for the delivery date change because he did not even know the old delivery date. 

if the PO was transmitted, then SAP does not change the statistical delivery date automatically while the delivery date is changed. 

The buyer has to start thinking who is responsible for delivery date change, if it is the vendor, then it is just okay that the statistical delivery date is not changed automatically. the vendor will be valuated against the unchanged statistical delivery date .

If your planner wants an new delivery date, then it is not the vendors fault, in this case the buyer has to change the statistical delivery date manually equal to the delivery date, so that the vendor evaluation is done against the new statistical delivery date .

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Statistical date will stay fixed if you make sure that message output took place. If no message output, it seems like the system sees it as not firmed yet and therefore change the date. Please let me know

 

The statistical delivery date is basically used for vendor evaluation. It is changed along synchronous with the delivery date, if you have not yet outputted the order. After the output, the statistical delivery date will not change automatically with a delivery date change.

The reason is, the delivery  is used for your planning, while the statistical del date  is used for vendor evaluation. If the vendor says he cannot meet the expected delivery date, then you  change the delivery date to the new date to make your planning information accurate. But the statistical del date will stay untouched, you evaluate your vendor against this Stat del date and he gets a bad rating because he did not meet your delivery date.