Plan Inputs Collected Shipments History SO line, Sales Organization Level = null and/or Sales Rep

Summary:

SCP Plan Input collected shipment data:

Why column "Sales Organization Level" sometimes some SO lines have "Sales Rep" and other times it is empty? And sometimes the same SO line have both "Sales Organization Level" = "Sales Rep" and "Sales Organization Level" = null

Where is the "Sales Organization Level" setup?

Content (please ensure you mask any confidential information):

Same Sales Order line have two "Shipments History: Requested Item by Shipped Date" collected rows in Plan Inputs the only difference is the "Sales Organization Level" column that one row is empty and the other contains "Sales Rep".

We need to figure out why is this happening and how can we collect only one row of data?