This question is related to creating a bank statement in Odoo V16 Enterprise. 

Can anyone explain the logic of why Odoo Out-of-the-Box does not assign a bank statement to bank line transactions, despite selecting the boxes of all line items that would be associated with a bank statement and using Action > Create Statement? 

Odoo creates a statement, but doesn't assign the statement to any of the transactions you selected. In my case, I have 500 bank lines for the month of June that were pulled into Odoo using Online Synchronization. It is my understanding that I need to select all of the bank statement lines that are associated with the June bank statement, then create a statement and input beginning and ending balance. However, when I do this, the statement is successfully created, but the system ignores the line items I selected. This would then require me to manually select the bank statement on each of the 500 bank statement lines for that month. 

I'm hoping that this isn't working as intended, and maybe I am missing a step. According to my Gold Partner, this is unfortunately how V16 works out of the box and I would need to customize it. If this is the case, what is the point of even having the ability to select the transactions to create a statement if the system is just going to ignore it?