SAP Message USMD1753 - Data model &1, entity type &2: Change of prefix

Diagnosis
You have changed the prefix for a temporary key from &V3& to &V4&.Either you changed the prefix explicitly, or you changed it implicitlyby deleting or adding a prefix while entity type &V2& is restricted tointernal key assignment (in this case, the default prefix is $).
This can lead to inconsistencies, if entities of type &V2& exist in thesystem with temporary key values (which begin with the prefix &V3&).This also affects all systems to which this Customizing is transported.

System Response
The change can be saved.

Procedure
Check if the change is necessary, and undo the change if it is notnecessary.