HUs must have identical warehouse numbers. Packing not possible

What causes this issue?

Handling units that are in a HU-managed <DS:DE.LGORT_D>storage location
</> must have the same <DS:DE.LGNUM>warehouse number</>.

System Response

Packing is not possible.

How to fix this error?

Either pack the material or handling unit in a handling unit that has
the same warehouse number or create a new handling unit to pack the
material or handling unit into.

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.