Account Invoice Tier Validation - Forward Option

This module extends the tier validation approval process on vendor bills (account.invoice) with a Forward option.

When a bill is waiting for approval, a reviewer who is allowed to forward it sees a new Forward button next to the existing Reject button on the bill form. The button only appears when the user has the right to forward that document.

Pressing Forward lets the reviewer hand the approval over to another user. According to the module description, this creates a new tier validation on the fly for the selected user as a minor sequence tier (for example 1.1 or 2.1), and the current tier is marked as Forwarded instead of simply approved or rejected.

The module does not add its own menus or models; it only adds the Forward button and the related visibility field to the vendor bill form, building on the base tier validation forward feature and the account invoice tier validation feature. It installs automatically when both of those modules are present.