Defaults could not be determined for liquid hydrocarbon product

What causes this issue?

The conversion modes "automatic" and "semi-automatic" may require
defaults to be maintained prior to Quantity Conversion Interface (QCI0
processing for liquid products or natural gas. This plant/storage
combination uses one of these two conversion modes.

How to fix this error?

Either change the conversion mode in Customizing to use a different
conversion mode (that is, 3 or 4), or maintain the default parameters
for the material. If your system is configured to use the new default
transaction, use Transaction O3DEFAULTS.
If your system is still set up to use the old default transaction and
table, use Transactions O3C1/2.
You can check the setup of your system with Transaction O590.

Procedure for System Administrators

This message can be customized to appear as an error, warning,
information or succes message or to appear not at all (Transaction
O591).

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.