Supplier &1 is blocked for company code &2

What causes this issue?

Supplier & is blocked for company code &.

System Response

The master record for this supplier is blocked for processing for the
specified company code.

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.