STO [UB] document type - Statistical Delivery date gets changed when we change PO delivery date

Hi Team

Statistical Delivery is getting changed, if we change the the Delivery Date for the STO PO.

FYI, there are no PO Message Output type for Outputting, as this is what business working for all Intra STO PO [UB]

But is there any way, that even the delivery date is changed, the Statistical delivery date should not get changed.

Your replies are highly appreciated.

Thanks and Regards

Kalyan