I would use a more formal register here

here are a few examples of purported responsibilities I found on the net:

...they were not willing to release RSL from its purported responsibilities toward them.

...can be used to lead corporations to assume their purported responsibilities.

... fulfill your purported legal responsibilities,

Determine whether the appointed management representative actually has the purported responsibility and authority granted to him/her by the firm's procedures or organizational structure. Ways of reaching this determination include: Whether he/she has sign-off authority for changes to documents, processes, or product designs;
http://www.fda.gov/ICECI/Inspections/InspectionGuides/ucm170...