Before editing Key Schedule data it is important to understand that Key Schedule data varies from regular schedule data in a few important ways. Key Schedules automatically create a project-specific unique parameter that cannot be shared across categories OR across linked files. For this reason Key Schedules cannot support the Save Link and Load Link functions, nor do they support the ability to include linked file data. Lastly, Key Schedule data is inherently instance-based data, so a Key-base link cannot be converted into a type-based link.
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