UoM HR and H conversion

In the R/3 transaction, the UoM entered can either be H or HR. Example, I have the following two transactions entered for the same Workorder

in R/3:

Workorder...UoM...Actual Work

10005876....H..... 2.5

10005876....HR.... 3.3

When these transaction extracted into BW, I can see the following in PSA, and in the InfoCube as well:

Workorder...UoM...Actual Work

10005876....H..... 2.5

10005876....HR.... 3.3

I created the query for this and have the following display on the result also for the same Workorder:

Workorder...UoM...Actual Work

10005876....H..... 2.5

............HR.... 3.3

Question:

1) Is there a way how can I do the conversion of UoM in Query Designer so that when I display, I only have the following:

Workorder...UoM...Actual Work

10005876....HR.... 5.8

2) I guess a proper way would do the UoM conversion in the Update Rule, but how?

Please help, thank you!