How can I edit a customer invoice

[DeshiNode]

How can I edit a customer invoice, and how to split an invoice

https://prnt.sc/VbucS_WjuyrG

[wsa]

This is what one WHMCS Staff tell me

You have the option to make the change to your WHMCS configuration.php file and add the line $allow_adminarea_invoice_mutation = true;, but it is your decision whether to do so.

When this line is present in your configuration.php file, the system will permit most of the changes to invoices that existed before WHMCS version 9.0, notably:

• Line items can be changed for invoices in any status (when in the "Manage" mode and with the correct admin user permissions set).
• All attributes are available in the Options tab regardless of the invoice status (when in the "Manage" mode and with the correct admin user permissions set).
• Payments can be applied in the Add Payment tab regardless of the invoice status (with correct admin user permissions set).

Please note that using this configuration line ($allow_adminarea_invoice_mutation = true;) in your WHMCS configuration.php The file is highly discouraged, as it may permit changes that are not compliant with regional/country business regulations and complicate accounting.

To bring awareness of this, a Warning health check will appear in the System Health Check summary when the value is present in your WHMCS configuration.php file. Additionally, all “full administrators” will see an Admin Warning banner (which can be dismissed up to every fortnight). You may want to add it temporarily if you do need to make the changes listed above, which were changed in WHMCS version 9.0 to improve invoice management and ensure tax compliance by keeping invoice records consistent. If you do not see any warnings or have issues with editing invoices or changing their status when this line is added, please let us know.

Starting with WHMCS version 9.0, non-Draft invoices are immutable. This means you cannot edit transactions (now listed under the Ledger section on the invoice), add or remove items, or modify descriptions on an invoice once it’s no longer in the "Draft" status. This change is intended to improve invoice management and ensure tax compliance by keeping invoice records consistent.

For more information on invoice management in WHMCS version 9.0, please refer to the following documentation:

• https://docs.whmcs.com/9-0/billing-and-invoicing/invoice-management/