Error reading material master record of &1

What causes this issue?

The base unit of measure must be determined from the material master
record for component <(>&<)>1. An error occurred in this process.
Possible errors include:
- Material master locked, or error in the lock table
- Incorrect material name, material master record deleted or not
maintained correctly

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

Error message extract from SAP system. Copyright SAP SE.