With this, we are done with our customization. The following screenshot shows how the window looks after the changes:

In this recipe, we changed the data types of Start Date, Start Time, and End Time in steps 1 through to 6 and placed Start Time and End Time fields in the same line in the steps 7-8. The default Reference Date+Time, which ADempiere guesses for the timestamp columns, would show the date as well as the time. So, in order to change the type, the following is the field and Reference mapping:

When it comes to showing multiple fields on the same line, ADempiere uses the Same Line flag at the field level to determine whether the field needs to be rendered to the next line or to the same line. ADempiere uses a two column layout for the tab panel. Hence, at most, only two fields can be displayed in a single line.

ADempiere determines the field data type and validation using the field Reference. There is a list of pre-defined Reference lists, which ADempiere provides. Moreover, in case you need, you can also create a new reference for your application. You may refer to the supported Reference list at http://en.wikiversity.org/wiki/ADempiere_Application_Dictionary#Reference.