Incorrect target cardinality value for source structure &1; see long text

What causes this issue?

Consider the situation where you map a source structure to a target
structure, and specify the access type ?Split? for the source structure.
If the target structure has a parent node, then the value of the Target
Cardinality field must be the same as the value of the parent node.

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

If you want to use the access type ?Split? for source structure &V1&,
you need to change the value of the Target Cardinality field to &V2&.

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.