Resource Levelling... Activities that cannot be leveled

I've created a resourced schedule for design management. The schedule seems to be fine when resource leveling when the "Defult Units / Time" is set to 100% and the "Max Units / Time" is set to 100%
I'm trying to reduce the available time for 2 of the resources from 100% to 60%.
When I resource level after changing the Units/Time percentages for these resources the Resource Usage Profile continually shows a over allocation. Change if back and is OK again.
When I review the resource level log it says that there are a number of "Activities that cannot be leveled".
When I check the tasks it seems they do not level.
These tasks all level when the Unit/Time is 100% or greater.
Does anyone know why these are not leveling??
Cheers

I'm not an expert at leveling resources, but I'd guess your resource assignment on those activities that don't level is at 100%, meaning you need the full attention of 1 resource the whole time that activity is active. If you reduce the resource availability in the dictionary to 60%, the activity still says, "Hey, given my duration and number of units, I need 100% of the resource." Thus, even if there were no other activities with that resource assigned, you'd be overallocated when these activities are scheduled to occur, and P6 can't level that resource/activity.
To experiment with this hypothesis, increase your duration on the activity (or decrease the number of units or the units per time... depending on your "duration type" setting) so that the resource requirements are at 60% (or whatever you're setting your max to) and try to level again.

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