In Primavera P6 -> Resource Usage Profile, we may have a problem that Unit of measure is not showing.
There could be various causes for this issue:
1) If the resource is a Material resource, the Unit of measure is not specified.
FIX:
If the resource is a Material resource, you will need to specify the Unit of measure in Enterprise, Resources in the Details tab.
2) If it is a Labor or Non-labor resources, the Show Unit label is not selected.
FIX:
If it is a Labor or Nonlabor resources, then make sure that in Edit, User Preferences in the Time Units tab the Show Unit label check box is checked.
3) You are using the Calculate Average feature.
FIX:
If you are using the Calculate Average feature in the Resource Usage Profile Options, then make sure that you specify a unit of measure in there.
Check and fix those cause then you can show the Unit of measure:
Khuong Do Blog 
good info thanks
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thankyou for your useful information
CAD centre in Kochi
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Hello Mr. Khuong Do . Can you help me with my problem.. My primavera does not have a unit of measure in the Resources. I tried looking for m2 or tons but there are no units of measure in the resources.
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Hi.
You have to create the unit in Admin menu.
You can refer to instruction here https://doduykhuong.com/2017/03/07/how-to-assign-resource-resource-loading-make-resource-plan-in-primavera-p6/
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