If a will, executed as required by this Code, incorporates into itself by reference any document or paper, such document or paper shall not be considered a part of the will unless the following requisites are present:
(1) The document or paper referred to in the will must be in existence at the time of the execution of the will;
(2) The will must clearly describe and identify the same, stating among other things the number of pages thereof;
(3) It must be identified by clear and satisfactory proof as the document or paper referred to therein; and
(4) It must be signed by the testator and the witnesses on each and every page, except in case of voluminous books of account or inventories. (n)
SUBSECTION 6. Revocation of Wills and Testamentary Dispositions