To be able to assign a resource to tasks, make sure all the following attributes are correctly set:
Set the resources skills for task assignment. This will determine to which tasks this resource can be assigned.
From: Manager > Rolodex tables > Resources > Magnifying glass > Skills for task assignment:
Languages (source and target) he can do the resource can be assigned to (Fig 1)
Task types he can do the resource can be assigned to (Fig 2)
Order types he can do the resource can be assigned to (Fig 3)
Once the resources skills are set, only relevant resources will be displayed in the resource pull-down menu when assigning resources to tasks.
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