Fast Formula is treating DBI as Local Variable

Summary:

I am not able to use DBI "PER_PER_BASIC_ATTRIBUTE2" in my fast formula. This DFF field holds a flag with value Y/ or N or null .

I got Fast Formula Compilation error:  local variable was used before being initialized.

I am able to use PER_PER_BASIC_ATTRIBUTE_DATE2 or PER_PER_BASIC_ATTRIBUTE_NUMBER1. for other purpose.

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Code Snippet (add any code snippets that support your topic, if applicable):

DEFAULT FOR PER_ASG_FTE IS 0
DEFAULT FOR PER_ASG_FTE_VALUE IS 0