English to Spanish Bus/Financial Human Resources part of an Excel sheet

Hello, this is on an Excel Sheet, in its own cell, so not part of any paragraph. The document is in US English and has to do with HR. This is part of internal communications within a large company, and the target audience will be in Spain. To give a bit of context, the cell directly above says, "RPF (Pension Fund) Registration Number" and the cell directly below says, "Last Pension Average". Is "Haf" an abbreviation? I cannot understand what it refers to, much less translate it. Any ideas would be greatly appreciated.