How to handle Artist and Albumartist

[aliasname]

(23-12-2016 17:07)aliasname Wrote:  Anyway most things solved with the help of you and this forum. Great.

and just after having written these lines I digged the user manual a bit more, which made me doing a tagUpdate file containing combinations like these:
@DATE=1970
&RELEASEYEAR=1970
-RELEASEYEAR=1970
[... till year 2016]
results in an error. so the -+= only act upon the name starting with @
since if doing it the other way round:
@RELEASEYEAR=1970
&DATE=1970
-RELEASEYEAR=1970
[... until 2016]
Which gives no error @all by minimserver when doing a rescan, but which also shows no effect.
I expected that the RELEASEYEAR would get blanked in case it equals with the content of the date?
I doublechecked that my flac to have these TAGS and with an equal value.