Can't Modify Reserved Variable (AICC_Score)

I am attempting to have a course automatically marked as complete for posting to an LMS (publishing to SCORM 1.2). Everything I read says to modify the variable AICC_Score. However when attempting to Modify Variable:

- Target is a drop down and AICC_Score is not listed

- Lectora will not let me create a new variable AICC_Score to modify because it says it's already used

- AICC_Score is not listed in the Variable Manager


So how do I modify AICC_Score or any reserved variable???

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