ID:138064 Unable to add partition "<name>" to the design because it has multiple parent partitions, which is not allowed

CAUSE: The Quartus Prime software is unable to add a partition to the design because it has multiple parent partitions. The Quartus Prime software enforces that every partition must have at most one parent partition.

ACTION: If you see this message after manually editing the Quartus Prime Settings File (.qsf) for the project, remove the setting from the Quartus Prime Settings File to avoid seeing this message again.