Business Partner details cannot be accessed due to central block flag

What causes this issue?

You tried to assign the business partner to a CMS entity or to change a
CMS entity to which the business partner is assigned.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

However, this is not possible because the corresponding business partner
data record has already been blocked. The business partner has to be
protected because of data security reasons.

System Response

The system cannot process your entries

How to fix this error?

Make sure that the business partner used has not been blocked because of
data security .If necessary, the business partner can be unblocked by
authorized users.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.