Hello,
At the time of recruiting an employee, salaries are negotiated/offered based on what the employer considers fair, just, or generous. The prospective employee accepts and joins. No comparisons are made as facts of others are not known.
Increments are based on performance as judged by the functional superiors (at least should be) within the overall limits of the organization. HR's role is simply that of a facilitator/coordinator of the process of Performance Appraisal/Increments - I mean generally.
Based on these assumptions, the reported dialogue is, at best, a grievance-handling/resolving opportunity as far as HR is concerned. HR can use its good offices with the concerned superiors, not to plead the case of the aggrieved, but to point out a need to reevaluate the department's process by its bosses to ensure fairness, objectivity, and transparency to establish credibility.
Personally, I would like to handle the presented situation in this manner.
Regards,
Samvedan
August 27, 2010