Hi Michael,
At RSA6, have you unhided your AEDAT field. pls check and let us know.
i think not, so go Tx - RSA6, select your data source, double click on next screen if AEDAT field was selected for hide then un select and save it. later check it.
if its un selected then you can directly enter as AEDAT at RS02, generic delta- field name.
Thanks