Here is a fairly long discussion of the statute of limitations in legal malpractice in Alabama. They recognize the interesting question of whether the S/L starts to run before damage occures.  For example, what if there is a mistake in creation of a will, but the will is not yet probated?  Other examples are where there are problems in a deed or easement, but the house has not yet been re-sold.  In any event, here is a well written discussion.