2 content types for 1 date field : second content types nodes don't show

Hi,
I've got two content types (let's call them A and B) using the same date field (field_my_date). When I want to list both of my content types in my month calendar view, only the A nodes are showing up. If I use filter to see only B nodes, none is visible anyway.
I tried to create a second date field (field_my_other_date) in B : If I select only field_my_other_date in the Date contextual filter checkboxes, they are here, but if I check field_my_date too, then I've got only A nodes visible again.
In can't use two different date fields, one for each content type, because in another view, I need to list them as a list, and order it by date, and I can't order nodes by date from two different date fields, isn't it ?

Any idea how to solve it ?
Thanks.