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With Mydac version 8.5.17 and Delphi XE8 must re-declare all fields of tables and queries. If you do not, the fields lookup do not work neither mastersouce.
As happens apparently were declared with an older version of MyDAC or Delphi.
I could not play but a field that was declared TasAutoIncfield is now how TWordField or TByteField as the case

Unfortunately, we can't reproduce the problem. To investigate this behavior of MyDAC, please send a small sample to demonstrate the issue to viktorv*devart*com, including a script to create and fill in the test database object.