A similar case tracking solution exists already, and is used by among others Open Atrium. There is currently a 7.x version in the works, and a lot of progress has been made on it. Perhaps it would be sensible to look into merging the two projects in some form, to join forces? For an example help Case Tracker 7.x mature and support the features ERPAL needs (if it doesn't already), then retire this module (ERPAL Project) in favor of it?

A discussion on the 7.x version (currently available as dev) can be found here: #1653184: Case Tracker 7.x-2.x - a new approach, with entities

A recent call out for helping define what kind of features it should support can be found here: #1893138: Defining Case Tracker use cases: how do you expect this module to work?