&1 &2 in company code &3 is blocked; see long text

What causes this issue?

&V1& &V2& is blocked in company code &V3&. The data of this business
partner might contain personal information and is therefore blocked.

System Response

To protect personal data, the system does not display any data for this
partner. You cannot create or change any documents. If you want to post
new documents using a reference document, any items with this partner
will not be copied from the reference document.

How to fix this error?

If you are certain that you want to create or change a document for this
business partner, use transaction BUP_REQ_UNBLK to request that the
business partner be unblocked.

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.