Save/modify custom client field on invoice page

Hello there!

It is a bit tricky ; but I need each time an invoice is saved, my custom field " client_custom_ultima_lectura_cliente " was modified /saved.

I show in an input on view page , but not how modify the controller to save the value on BD.

Thanks in advance.

Regards!

Could you please specify what you want to achieve? It’s not clear what you want to do with your custom field?

Sorry for my poor English.

I need to save a custom field value from the clients table through invoice view.

Do you understand better now?

Thanks in advance.