A credit or unapplied payment appears on a lease when:
A tenant pays more than the balance due (overpayment), or
A payment is received before a charge is posted
The credit will remain until a charge is posted and the payment is applied to it.
How to Handle It
Post a charge first before receiving a payment.
Accept the overpayment as prepaid rent and apply it to next month's charge.
Wait until the next charge is posted — the credit will apply automatically.
Do nothing — the credit will remain until it is applied.