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The administrator is enabled to change the invoice items amount or remove the InvoiceItem by setting the amount to zero. If the invoice item is changed, it needs to be reflected on the BorrowerAccount. If the invoice item is reduced and expecting the customer not to pay that anymore, it needs to be reduced on the BorrowerAccount. Otherwise, the next invoice will pick that up for next invoice. That is explain in this page https://bricknode.atlassian.net/wiki/spaces/KB/pages/3872522251/BorrowerAccount#Transactions.
Likewise for increasing the invoice item that the BorrowerAccount needs to be matched with the deficit. Otherwise, the Invoice will not be paid since it’s missing deficit on the BorrowerAccount and goes to Reminder etc.