How do I get the overall performance rating code using Fast Formula in Workforce Compensation?

Summary

I can get the value using the Performance > Performance Management Overall Rating column in the worksheet but I need to get the same value in a fast formula.

Content

I can retrieve the overall rating in the Workforce Compensation worksheet using column Performance > Performance Management Overall Rating but I need this value in a fast formula for the calculation.

I have seen in a document on MOS that HRA_SECTION_RATING_FF_RATING_LEVEL_CODE will return the value:

How To Retrieve Latest Performance Rating Into Fast Formula Type Compensation Default And Override? (ID 1987150.1)

But this formula won't compile saying "...line 21, either function HRA_SECTION_RATING_FF_RATING_LEVEL_CODE does not exist or the combination of parameter types does not match the statement." The DBI exists as an array.