Non-assigned volume &1 &3 is not sufficient for packing the item

What causes this issue?

This text is similar to message HUGENERAL065
The item that is to be packed has a volume of &V2& &V3&. The
non-assigned volume of the handling unit (or this handling unit's
higher-level HUs) into which this item is to be packed only amounts to
&V1& &V3&.

System Response

This item cannot be packed.

How to fix this error?

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

Procedure for System Administrators

Either choose a different handling unit for the item to be packed into
or change the allowed volume for the handling unit in question on the
details screen.

Error message extract from SAP system. Copyright SAP SE.