The field for external material numbers is not long enough

What causes this issue?

The material number &v1& should be written in a field that is &v2&
characters long. However this length is not sufficient.

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?

Procedure for System Administrators

Inform your system administrator and create an SAP customer message.

Error message extract from SAP system. Copyright SAP SE.