Importing Delivery Units Failed in HANA

Symptom : During the installation or upgrade of HANA, you encounter issues in the step "Importing Delivery Units".

With revision 45 and newer the following messages appear in the log:
Importing delivery units...
ERR: Upgrade failed
ERR:   error upgrading
ERR:     Import of delivery units failed
ERR:       Cannot import delivery

Starting with revision 46 an upgrade will not fail but return the exit code 2 and print the following message:
#####################################################
# Problems occurred while importing delivery units (content).
#####################################################

Solution  : Importing the delivery units is the last step in both installation and upgrade. If this fails your system will still be up and running.

Unless you are using HANA XS features fixing the import issues is not mandatory.If you are using the system to develop or run HANA XS applications, try to solve these issues by repeating the import of the affected delivery units.

To get SAP Hana delivery units consistent it is not sufficient to start SAP Hana upgrade process (by hdbupd or hdblcm) again.

Delivery Units Detail and Location:

HDB:SIDadm:  xyz/usr/sap/SID/global/hdb/auto_content 82> ls -latr

------------------- Importing Delivery Unit Manually ------------------------

regi import  Delivery _Unit_Name  --key=WW

Example:
regi import ADMIN.tgz --key=WW