Warning: Data source does not have an OID field

This table or layer does not have an ObjectID field.

Solution: Export the table or layer to a new table or feature class.

More information: An ObjectID field is required to edit a table or layer. With some data sources, adding an ObjectID field still may not make the layer or table editable. However, exporting the table or layer to a new table or feature class provides a fully editable data source.