What is the definition of non-severable tasks versus severable tasks.
This response is based on the information provided. We suggest you discuss with your contracting and finance team, program manager and/or legal department as appropriate.
We believe you are searching for more than the definition of non-severable tasks versus severable tasks.
"Severable" describes an action that can be divided into two or more parts that are not necessarily dependent upon each other.
"Non-severable" describes an action that cannot be divided into two or more parts without negatively effecting performance of the task.
If your attorney says the task "appears" to be severable, it sounds as if s/he is leaving room to be convinced otherwise. You need to assess what about the task defines it as non-severable, why breaking the task apart makes it ineffective, unworkable and convey that to your attorney.