Andrew,
Business Central allows for a multitude of transaction types to post to a Customer and their sub-ledger (Customer Ledger Entries). This includes:
Sales Invoice
Sales Return Order, which produce Sales Credit Memos
Sales Credit Memos
Sales Corrections, which produce reversal of a Posted Sales Invoice or Posted Sales Credit Memo
Finance Charge Memo
Customer Payments, called Payments
Customer Refunds, called Refunds
Reminders are not a transactional document that posts an entry to the General Ledger or Sub-Ledger. It is a feature in which you can setup reminder emails that are sent to customers who are past due based on a rule.
All-in-all, Business Central can create all types of adjustments to a Customer account.
Hope this answers your question.
Thanks,
Steve