build identifier: 2.5.2.v20100202

chart should forbid to dnd measure to category x axis and optional y series, also it should forbid dnd dimension to y series

reproducible: always

steps to reproduce:
1.new a cube
2.insert a chart, bind with cube
3.dnd measure to category, dnd dimension to y series

expected result:step2,3 should be forbidden

actual result:user can do step2,3
fixed. forbid the incorrect cases.
verified in build 2.6.0.v20100311