Building Basic Dimensions and Cubes - Expert Cube Development with SSAS Multidimensional Models - page 57

It's quite common for deployment to fail as a result of you making a mistake
somewhere in your cube or dimension designs. If this happens, you should see
all of the errors you need to correct in the Error List window. When you go to
the appropriate editor to correct the error, you should also see a red squiggly line
underneath whichever object it is that needs fixing as with the Month attribute in the
following screenshot:
Warnings and blue squiggly lines
Even if you don't see any red squiggly lines anywhere and your project
deploys successfully, it's likely that you'll see warnings in the Error
List window and blue squiggly lines in various places in SSDT (see for
example, the Date dimension node in the preceding screenshot). These
design warnings will occur where you have built something that works,
but does not reflect best practice. A few of the warnings concern quite
trivial things, but in general, it's a good idea to pay attention to them.
If you want to though, you can dismiss warnings by right-clicking on
them in the Error List window and clicking on Dismiss , while leaving
a comment explaining why you've done this for future reference. You
can also manage which warnings appear and see which ones have been
dismissed by right-clicking on the project in the Solution Explorer , by
clicking on Edit Database to open the Database Editor and going to the
Warnings tab