Unexpected Behavior of Item`s Lead Time in GOP simulation

Summary:

GOP is not considering the Post Processing Lead Time of Manufacturing BU after adding Processing Time to the Transferring BU.

Content (please ensure you mask any confidential information):

We have an Assembly Item "17410930" and a Component Item "DB13401S".

For the Assembly Item "17410930" in Manufacturing BU the lead time is following:
Preprocessing Days=2

Postprocessing Days=0 Fixed=5

Processing Days=5

For the Component Item "DB13401S" Manufacturing BU:

Preprocessing Days=2

Postprocessing Days=2

Processing Days=10

For the Component Item "DB13401S" in Transferring BU:

Preprocessing Days=(null)

Postprocessing Days=(null)

Processing Days=(null)

We also have Sourcing Rule Assignment and ATP rule assignments, which we can share if necessary.