Im trying to remove this Error

I already build up a Offline Cache Mode with this guide but I cant remove the DataForms from my CDS.
Is there a Option to remove or to ignore this Error ?
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And How Can I save my DataForms to a single Row in a Collection ?
Collect(
OfflineData;
DataFormPage1.Updates;
DataFormPage2.Updates;
DataFormPage3.Updates;
DataFormPage4.Updates;
DataFormPage5.Updates;
DataFormPage6.Updates;
DataFormPage2Bemerkung.Updates;
DataFormPage3Bemerkung.Updates;
DataFormPage4Bemerkung.Updates;
DataFormPage5Bemerkung.Updates
)
This Code is making 10 Rows to my Collection