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Hello Folks, we are trying to use the TSQLTimeStampOffsetField defined in Data.DB.pas for a TFDMemTable. We created a static field list and tried to open the TFDMemtable. We run into an error: The call stack ... Data.DB.DatabaseError('Type mismatch for field ''Start'', expecting: TimeStampOffset actual: Unknown',$1767270) Data.DB.DatabaseErrorFmt('Type mismatch for field ''%s'', expecting: %s actual: %s',(...),$1767270) Data.DB.TDataSet.CheckFieldCompatibility($1758D20,$17FFE10) Data.DB.DoBindFields($17FFF60) Data.DB.TDataSet.BindFields(True) FireDAC.Comp.DataSet.TFDDataSet.InternalOpen Data.DB.TDataSet.DoInternalOpen Data.DB.TDataSet.OpenCursor(???) FireDAC.Comp.DataSet.TFDDataSet.OpenCursor(False) Data.DB.TDataSet.SetActive(???) FireDAC.Comp.DataSet.TFDDataSet.SetActive(???) Data.DB.TDataSet.Open FMain.TfrmMain.FormCreate($1780E30) Vcl.Forms.TCustomForm.DoCreate Vcl.Forms.TCustomForm.AfterConstruction System._AfterConstruction($1780E30) Vcl.Forms.TCustomForm.Create(???) Vcl.Forms.TApplication.CreateForm(???,(no value)) ... indicates that the TDataSet.CheckFieldCompatibility method points to a FieldDef for the column Start, for which the data type is unknown. I have tried to setup the FieldDefs first before opening the TFDMemTable but that did not help either. Why can I define a field of type TSQLTimeStampOffsetField but when I open the dataset the data type is unknown? I am using Delphi 11 Alexandria Version 28.0.42600.6491. Thanks for a short answer in advance. Salut, Mathias