Business partner list is empty (target group not created)

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

What causes this issue?

The business partner list is empty because of one of the following
reasons:
Business partners have not been assigned to the selected node in the
business partner hierarchy or to the subnodes of the hierarchy
Business partners have been assigned to the business partner hierarchy
node (or its subnodes) but the sales areas assigned to the business
partners do not match the selected sales area

System Response

No target group is generated.

How to fix this error?

Check the selected:
Node in the business partner hierarchy
Sales area
If these entries are correct, go to transaction <ZK>Maintain BP Group
Hierarchy</>.
Check whether the :
Business partner hierarchy used in Marketing is correct
Business partners assigned to the hierarchy nodes belong to the correct
sales organization

Error message extract from SAP system. Copyright SAP SE.