​@VanChampS I would start by looking at your Supply Chain Matrix for Supplier. There you can specify different transport times per ship via code.

So maybe you have different leadtimes defined for each Ship-Via code. Then it makes sense that the dates in the PO would change and new dates will be calculated considering the leadtimes for the different ship via code.

Hello Marcel,

Thank you very much for the update and I totally agree with your thoughts  but my concern  is why system touched the Wanted and Promised Delivery Dates . .Its OK to adjust the Planned Delivery date, Planned Arrival Date and Planned Receipt Date based on the lead time defined on new ship via code.

Please let me know your thoughts.

BR

Champika