Error deleting entry from DB in custom module table

[Vanlombardi]

Hello guys,

I just made a simple module for my customer so he can delete invoices without accessing database.

The plugin shows a table with all invoices and the main concept is to remove the db entry when "Delete" action is cliked. But the following error pops up:
"An error occurred while deleting the object. order_invoice (cannot load object)"

 

Do i have to define the delete action logic somewhere? Thought those default actions were already defined. 
 

I'm having trouble to find documentation aside from the basic module set up from prestashop docs.

Thank you!

[Vanlombardi]

Okey, made it adding the method processDelete().

 

Did not found this on the docs, anyone knows nice prestashop documentation?