You might have noticed a  carat symbol next to your Price/Unit when you are assigning resources or roles. This usually happens because of following reasons:

1) Role has been assigned to the activity

When Role is assigned to the activity Price/Unit is taken from the default settings of the project.

Assuming the default for the project is 1/hr

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When we assign a Role to the activity, it picks up this rate and a carat symbol is displayed

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2) Rate source is Role

If a Role has been assigned to a resource and we change Rate Source as Role a Carat symbol is displayed again

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