From what I understand is that you have only one dimension in Row and you are trying to hide it.
This won't work as you need at least one more dimension in row so that data is displayed in the intersection of this dimension with column dimension.
You would need to add one more dimension in row and the hide then LineItem dimension.
Your columns have two dimensions, one seems to be Period and other seems to be Year. So hiding period dimension in columns is working fine with you as year dimension is still available in column for representing the data.
I'm very sorry that i just reply it now. i already try to patch to 303 but still have the problem.
Then we try to post this issue to oracle support, and then they said that they can replicate this problem and said this is a new bug.
So now we just wait for them to release a new patch to solve this issue.