Which Processing Lead Time BUY Planned Order Takes ? How it takes Purchase LT at Item level.

Summary:

We Have the BUY Type Item- EYB016

At Item Level - Process Lead Time = 25 Days

At ASL Level- Process Lead Time = 20 Days

Result-

Planned Order is always taking the Lead Time at ASL level i.e 20 Days.

Scenario Tested

1) At Item Level / PDH-

Enforce Purchasing LT= NO

Planned Order is taking the Lead Time at ASL level i.e 20 Days.

2) At Item Level / PDH-

Enforce Purchasing LT= YES

Planned Order is taking the Lead Time at ASL level i.e 20 Days.

Please Advise-

What can be done so that Planned Order Takes the Processing Lead time at Item level i.e 25 Days ? ?