Credit note Vs Statement

hello, 

I need some help with understanding how the credit note is applied. I currently have several credit notes which are not related to specific reservation, but for participating in genius and preferred program,. According to booking they automatically applied my credit notes to my commission invoice. however when I check the invoice it seems that full amount was invoiced based on the stays for that month.

Does anyone know if booking removes stays from the invoice statement for which they apply a CN?