There is an ‘upgrade balance adjustment’ on my client’s account. What does this relate to?

Our new system provides you with improved access to cash. This cash facility operates using a running cash balance, and on migration this balance needs to start from zero. Whilst our current system doesn’t hold a cash balance today, some transactions behind the scenes do not always result in a net zero cash balance. The upgrade balance adjustment corrects this to ensure the cash balance is zero, enabling the cash balance on your client’s account to be accurate going forwards. No client money is used in this transaction which is simply an accounting transaction.