Default version not entered

What causes this issue?

At least one version exists for header material &v1& that is marked as
<ZH>always effective</>. However, no default version was entered.

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?

Enter a default version.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.