The visibility of the "Availability" column in the Certinia PSA Resource Planner is primarily controlled by two factors. First, the Resource Planner interface is customizable, allowing users to select which columns are displayed. If the "Resource Availability" column is not selected in the user's display settings, it will not appear. Second, visibility is governed by Salesforce's security model. If the managers' user profiles or assigned permission sets lack Field-Level Security (FLS) read access to the underlying field that populates the Availability column, they will be unable to see it, regardless of other settings.

A. Utilization Ermine checkbox is deselected under Utilization custom settings: This setting (likely a typo for "Engine") controls the calculation of utilization data. Disabling it would prevent new availability data from being generated, but it does not directly hide the column from the UI.

1. Certinia PSA Professional Services Automation Documentation, "Resource Planner Overview": This documentation details the user interface components of the Resource Planner, including the ability for users to customize the displayed columns. It specifies that users must select fields to display, which directly supports option B. (Reference: Access the official Certinia Documentation portal and navigate to the Resource Planner section for administrators).

2. Salesforce Documentation, "Field-Level Security": As Certinia PSA is built on the Salesforce platform, it adheres to its security model. Salesforce's core documentation explains that if a user does not have read access to a field via their profile or permission set, that field is hidden from them in all contexts, including list views, reports, and custom application pages like the Resource Planner. This principle directly supports option C. (Reference: Salesforce Help & Training, "Object Permissions" and "Field-Level Security").

3. Certinia PSA Professional Services Automation Documentation, "Utilization Settings": This guide explains the function of the Utilization custom settings, including the main engine switch. Its purpose is described as enabling or disabling the background calculations for utilization, scheduled hours, and availability. The documentation does not state that disabling this setting removes the corresponding columns from the Resource Planner UI. (Reference: Access the official Certinia Documentation portal and search for "Utilization Settings" in the Administrator guides).