Plannable date measures

Hi,

i need to create a plannable measure to plan the starting week of an activity.

If i create a date measure, then the user has to choose the day from the calendar popup; so he/she has to do the mapping from desired week to the right day.

Furthermore, there is not any check about calendar limit (need to add in the calc).

If I create the measure as a text measure, and set the Single Hier Sel. = week, then the user has to choose the right value from the picklist (he/she has not the possibility to type it).