Error: Could not create HU &

What causes this issue?

The system could not create the handling unit.erden.

System Response

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

How to fix this error?

Is the identification allowed? Is the identification part of an allowed
number range interval for external identification numbers?
Is the packaging material an allowed packaging material?
Are the quantities to pack consistent?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.