CDEF: Have CURRENT_DATA_SOURCE available in Custom String

[Mlapo]

When I define a new CDEF, I would like to be able to use the CURRENT_DATA_SOURCE special name in custom string. This way I would not have to hard code the letters a, b, c,... and thus I would be able to use only one CDEF to do the job.

I need this to be able to use function like
PREV([CURRENT_DATA_SOURCE])
intead of PREV(a) (or PREV(b), PREV(c),...).

Thanks

[raX]

You can already do this. I added a CDEF item of type custom string that reads: