Save functionality for a form screen with action as save for the Button

I have a scenario where i click on Edit button of one of the displayed list records. After clicking it navigates to a form screen with the data fetched from the selected list record. Here i have to edit the required fields and click on save Button(With Action in Clickhandling as SAVE) or a Save menu option so that the edited data shouldbe updated in db using a webservice call and the screen navigates back , where the updated data should be displayed.

When i'm trying this, its throwing an error saying "A field with the same name exists in the datatable" but actually there is no repeated column in entity or in the controls that i added to the edit screen. Here what ever is the primary key to the entity pointed to the edit screen it is showing the same field in the error.

Please suggest some ways to resolve this.

Thanks in advance.

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