protected boolean isValidOverlayBaseSpace(AddressSpace baseSpace) {
		if (baseSpace != getAddressSpace(baseSpace.getName())) {
			return false;
		}
		return baseSpace.isMemorySpace() && !baseSpace.isOverlaySpace();
	}
Determine whether the given space can have an overlay

@param baseSpace the overlay base address space
@return true to allow, false to prohibit
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/ProgramAddressFactory.java