HOW SSD and SAD are calculated based on RAD if On hand is available

Summary:

Sales Order:

Please find the matrix below and the dates GOP is promising based on providing RSD vs RAD.

FYI: Consider on hand is available, and a sales order is created for 20 quantities. It is defined as Make item. All lead times at the Product level are set as blank.

RSD	RAD	SSD	SAD	Transit time
19-May	NA	19-May	29-May	10 days
NA	19-May	15-May	25-May	10 days

Could you help me understand how SSD is derived in the second case, where RAD is provided instead of RSD?

In case of Internal Material Transfer,

For the requested delivery date populated on the Transfer Order - May 19th—SSD was populated as 16th May in the IMT order. I'm requesting your help in understanding how SSD is