How to change the Value Help of a date prompt to a calendar display (as in BEx)?

Dear A4O users,

I'm using A4O 1.4 SP9 on top of BO BI 4.0 and BW 7.30.

Does anybody now how I can configure the Value Help of a date prompt?

I prefer to give the users access to a calendar display to pick a date from (as I have in BEx Analyzer).

The field Req Deliv Date (ZEDATU) is referenced to 0DATE in the BW.

I'm still not able to show a calendar display in A4O after changing the BEx general settings on the BW InfoObject or in the BEx Query itself.

Below 2 screenshots of the same BEx Query executed in A4O and in BEx Analyzer.

Thanks in advance for any pointers!