No invoice generated after upgrading/downgrating on WHMCS

[ocastaned]

I am having trouble with invoices every time I upgrade or downgrade an account. Invoices are not being generated for the next month?

 

My customers receive emails that they need to make a payment, but that invoice is not into their accounts, so they don't know how to make the payment.

 

Any idea what is happening?

[WHMCS John]

Hi,

This could potentially happen if a renewal invoice had already been generated before the upgrade order was placed. To prevent this, have the client pay their renewal invoice first before placing the upgrade order.

 

To get invoicing going again on affected services, move the Next Due Date forward or back by one day, then click Save Changes.

[ocastaned]

It sounds good. Thank you.