PP/DS PPM to SNP PPM with lotsize

Hai,

When performing these conversions from PP/DS PPM to SNP PPM, why do we use always only "without lot-size"? I understand that without lot-size means a dummy order. But what about "with lotsize"?

How about PDS, when transferred from ECC, do we get PP/DS PDS and then we need to convert them into SNP PDS?

Thank you.