中译英：我收到了包括这份在内的6份debit note.

I have received 6 debit notes including this one

绝对不行！！请问included的主语是谁了？？debit是got的宾语，不能在作为included的主语
改成including作为伴随状语就行了
I received 6 debit notes including this one
或者作一个宾语从句
I received 6 debit notes which （that）included this one

include this one,i have received 6 pcs debit notes in total.

I've got 6 debit notes including the said one.

小问题，把included 改成including