Supplier & is blocked for all company codes

What causes this issue?

Supplier & is blocked for all company codes.

System Response

The master record for this supplier is blocked for processing.

How to fix this error?

You can find out which user has blocked the supplier master record by
displaying the master record change document.

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.