How to Use Unit Of Issue Setup at Item to be Used in Internal Requisition

Summary:

I have defined UOI for the Source Inv Organization(1003) at Item Level in PIM and also defined UOI at Destination Inv organization(1004) as like below but we are not able to see this Unit Of Issue while creating a Internal Requisition at "Select Supply Source"

Ex-

Create Item XYZ
UOM - EA
for Org 1(Source Org)
Unit of Issue - Pack
for Org 2(Destination Org)
Unit of Issue - Box

We are expecting Unit of Issue should be displayed here. Also we need to know how the "Unit of Issue" will be working.

Content (please ensure you mask any confidential information):