#89 Validation of timestamp fields

[Heinz Siegel]

A field of type TIMESTAMP seems to be not validated correctly. Display format of "DD/MM/RRRR HH24:MI:SS.FF4" displays a timestamp value in the correct format, but the format check of the framework means: "...doesn't match the format "DD/MM/RRRR HH24:MI:SS.FF4" (eg 31/12/2006 14:05:11.FF4)".