Repport / Planning / synthesis of availability

Hello,
Very thanks for your project, i use this since 8 years, on every new versions nice surprises with more and more amizing fitures !
On the last version (8.0.1) when i use rapport for check availability, new informations are display in ETP colon for ressources pool. My understand is the ETP capacity for the pool but my question is, why the capacity is negative for eatch month ? can you explain the algorith for calculate number of days availaible ?

Thanks

thanks for your answer, and in ETP colum what is the signification of the label "max(1)
" ?

I think i have found a probleme. With this last version, when i add new ressources in the pool the planification (duration) don't change. New ressources in pool not included in global capacity of pool in planning calculation. If i add directly new ressources on the task the planification is good.