Filter issues with cfdb-export-link

To produce a specific report I wrote a custom function to determine idf the record has an email. The function works fine with the cfdb-datatable but when I use the same filter in an cfdb-exportlink, it does not work. Here is the short code that works with the datatable:

[cfdb-datatable  form="2015 Flag Database"  edit="$_GET(edit)" show="FirstName,LastName,Email,HouseNumber,Street,UniqueID, Renew_status" trans="NaturalSortByMultiField($_GET(sortBy1),$_GET(sortBy2),$_GET(sortBy3),$_GET(sortBy4),$_GET(sortBy5))"
filter="has_valid_email()&&Route>=$_GET(routeS)&&Route<=$_GET(routeE)&&Renew_status!=Renewed&&Renew_status!=Removed"

Now here is the same code for the export-link:

[cfdb-export-link  form="Flag Database"  edit="$_GET(edit)" show="FirstName,LastName,Email,HouseNumber,Street,UniqueID, Renew_status" trans="NaturalSortByMultiField($_GET(sortBy1),$_GET(sortBy2),$_GET(sortBy3),$_GET(sortBy4),$_GET(sortBy5))"  filter="has_valid_email()"  filter="has_valid_email()&&Route>=$_GET(routeS)&&Route<=$_GET(routeE)&&Renew_status!=Renewed&&Renew_status!=Removed"    ]

When the export-link is executed it returns no data. If I remove the custom function in the filter it does return data.

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