Line level AP invoice approval not available - how are other customers working around this?

Summary

Line level AP invoice approval not available - how are other customers working around this?

Content

We are on 11.1.11.0. We understand that Line Level AP invoice approval is not available yet.

We have multiple lines on an AP invoice, coded to different Cost Centers and need a different Approval Group for each Cost Center. I am sure this would be a common requirement amount other organizations.

How are other companies getting around this common business requirement with the available (invoice document level) approval functionality?