for point 1, I have attached the error screenshot where we input the shipper name description, there is no output obtained.
For point 2, I am attaching the screenshot of the configuration where shipper description is the system info parameter
Kindly note that in EH list we are not getting any info related to shipper description created in point 2 in system parameter.
Lastly Z_shipper as per point 3 is maintained in selection profile details.