When the Proposals module is enabled, each employee has a Proposals Sales Commission card with % Amount and Fixed Amount. These pre-fill from the Client Config settings on the Order: Catering tab — Proposals: Default Employee Commission Percentage and Proposals: Default Employee Commission Fixed Amount — and are used when the employee is the sales agent on a proposal. Both values must be 0 or greater; otherwise saving fails with "Commission Values should always be bigger or equal to 0".