Requirement. The ability to update Sales reservations, when a reservation change source type.

My Users need to know how much stock is reserved on inventory and how much they are still waiting to come in.

Change Request.
A new EventSub on Codeunit CreateResrvEntry, Procedure TransferReservEntry. when the partner-record has it's quantity / Shipment Date updated (on code line 359 / line 379 / line 390)
OnBeforeModifyNewReservationEntry (Var OldReservEntry ; Var NewReservEntry ) {per each modify}
2nd event On Line 418 - OnAfterModifyNewReservationEntry (Var OldReservEntry ; Var NewReservEntry )