Hi Martyn,
Check your upgrade error log
As per SAP Note 1795885,
You got this message because import of any of the Delivery Units have failed.
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).
# To complete the content update, refer to SAP Note 1795885.
####################################################
As per the solution given in note:
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.
If the repeated import also returns with errors, further steps must be taken, depending on the nature of the errors.
Regards,
Vivek