Hi,
If you are exporting a list of values using Non persistable entity as a row object you will not be able to add it and this error will come. Associations in NP are only to client side and cannot be mapped and queried in background for export. A single NP without any associations will be possible to export.
The best way is to use persistable entity to hold the values you need to export and delete after the process is done.
Hope this helps!
He Keara,
A few things, hope this helps :-)
@Kamalanathan
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Just in case, anyone still faces this issue, that text is just a warning and is not always applicable for the current selected attribute. Very misleading