The e-learning course is being delivered by an external consultancy. The external consultancy has their own business case that justifies their involvement in the project. As a result, the project manager has refused to show the supplier any information related to ABC Company's benefits. This means that the external team manager has not seen any information relating to ABC Company's business justification for the project. Therefore, the external consultancy does not understand how the e-learning course contributes to the project's benefits.
Is this an appropriate action for the project manager to take, and why?