#UNAVAILABLE in WebI with BEx Query via BICS over ECC

Question

dear all
i have a very simple problem to explain.
when i try to use =Month([Flight date]) function, my key figure returns #UNAVAILABLE
that's it !
of course, without the function, the key figures are good, but i get every darn date, but that is not what i want. i want to sum up the amounts for each of the months.
when responding, please be mindful that there is no universe here, as it is via BICS.
thanks
g

Answer 1

hi sven
it is a date field, in fact it is a time dimension. so no problems there, but i tried this to test
=ToDate([Flight date];"dd/mm/yyyy")
this function works but does not help my scenario as i already have the full date and it did not group at all, but the interesting thing here, is that i lost my measure to #UNAVAILABLE.
i thought i would try
=ToDate([Flight date];"mm/yyyy")
which gave #ERROR in the field and still  #UNAVAILABLE in the measure. i guess you must have the "d" in there somewhere.
i then tried to proove the [Flight date] is recognized as a date by doing
=IsDate([Flight date])
the records came back with 1, which proves they are recognized as a date. so i cannot use subst as it requires a string. but this is going down the wrong path anyway.
then i tried
=FormatDate([Flight date];"mmm/yyyy")
which does this Apr/2011 for example, goes near and will do what I want to achive, but yet again the measure is #UNAVAILABLE again.
it seems that it just does not work.
i am this close of logging an SAP support error
I can get my grouping to work if I create a Month field in the source, and outside WebI, but i don't really want to do that. I want the variable webi dimension to work as it should, or i believe it should