As the German BA VISA stopped cooperating with BA last year, I also not accumulated miles since 10/2015.
The last flight redemption was 8/2015 ( which deducted partly from every account in our household ).
Is there a rule, that there has to be a move in every account withing a given period ( 12 / 18 or 24 month ??? )?, to keep the account active ?

If so, where can i find it ?
If so, which is the cheapest redemption, to make a move ? even I would not use it.
I only want to keep our 6xx k AVIOSfor future.
Thank's for pointing me to the right way
Bert