Diagnosis
This message often came up in case of supplementary components forcodes.

Procedure
E.g.: ListID contains redundant context information => no own field onthe database and redundant flag
Otherwise modify for the different proxy fields of one DB elementclashes => should not be mapped => set to final read-only
Otherwise specifically derivation of proxy name from DB Field namefails
In case of queries and actions this is not necessary!
If checks are executed for these fields, then the BOPF strcuture (notDB) needs a spearate field.