Lock the post button and details editing if the InvoiceNumbering App is doing it's magic

[claudiofreire]

Can Zuora Lock the "Post" buttons in the Bill runs and Invoices if the InvoiceNumbering App is correctly setup and active? This way users would only press post after being unlocked. Currently users press "Post" without knowing if the InvoiceNumbering App has finished, and it should be transparent to them.

Basically we need lock the post button and details editing if the InvoiceNumbering App is doing it's magic.