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93

answers:

1
+1  A: 

That is really undocumented (as almost everything with the cubes). As far as I could understand it that is an acronym for the link path for the field, T standing for Task and R for Resource. Recall that assignment is a relation between tasks and resources. This only happens in the assignment cube.

I've used any of them randomly with no trouble, so I believe you can just ignore it.

tozevv