You can of course use geomAnd on derived layers, but in this case you are trying to use geomAnd with a single layer - normally it would be done geomAnd(layer1 layer2) for example.
If you want to use the single-layer form of geomAnd, that means you're trying to do a selfLayer and - to quote the geomAnd documentation it says:
A selfAnd operation is performed by providing a single unmerged layer as input. An unmerged polygon layer is either an original graphics layer or the unmerged output of a geomSize command (see "geomSize").
A self-and means that it will and the shapes with shapes from the same layer - that only makes sense if the data is unmerged, because otherwise you'll always get nothing.
So what you'd do so:
OD_1 = geomSize( OD 0.005 unmerged )
OD_2 = geomAnd( OD_1 )
saveDerived( OD_2 "TESTING OD_2 ")
Note the "unmerged" keyword in the geomSize function. If you do this, it will find any gaps less than 0.01 wide between OD and other OD, or any self-overlapping bits of OD. Whether that is what you really want, I don't know...