How to set schedule ship date which is past date when importing legacy sales orders via FBDI?

Summary:

How to set schedule ship date which is past date when importing legacy closed orders via FBDI?

We tried to update override schedule flag using pretransformation rules and passed past schedule ship date which is less than current date however after submission GOP recalculated the days to current date or future date.

Is there any way we can acheive this?

Content (please ensure you mask any confidential information):

Past Schedule ship date

Version (include the version you are using, if applicable):

26A

Code Snippet (add any code snippets that support your topic, if applicable):