Supplier & blocked for purch. org. &, supplier sub-range &, and plant &

What causes this issue?

The <LS>Purchasing Block</> indicator has been set in this supplier
master record.

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?

Choose a different supplier.

Error message extract from SAP system. Copyright SAP SE.