If you have 4.0 or above version of SAP BO then you can follow the steps mentioned below:
1) Merge both the objects DIM_1 & then drag all the three objects like
DIM_1(From query1),DIM_1(From query2),Merged DIM_1
2) Now hide two objects : DIM_1(From query1),DIM_1(From query2) & keep merged DIM_1 as it is.
3) Doing above step you will get your desired result.
Thanks,
Swapnil