Inconsistencies between UI element &2 and UI element &1

What causes this issue?

All attributes that are used within the same table for the lower-level
UI elements of UI elements with the type <LS>Table Column</> or
<LS>Table Column with Key Field</> must have the same higher-level
entity types. The higher-level entity types of the attributes of UI
element &V1& and UI element &V2& are different, however.

System Response

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

INCLUDE CHANGES_CANNOT_BE_SAVED OBJECT DOKU ID TX

How to fix this error?

Change the attribute of UI element &V1& or &V2& to create a table.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.