Yes, the original document can be modified, with both parties agreeing on such modifications. But as a general rule, you can modify only the provisions related to child custody, child support, or alimony. The court does not usually accept the modifications in the division of the assets. Moreover, there must be significant changes in your life to justify these modifications. These changes may include a new job or dismissal that significantly influences one of the ex-spouse's income; one ex-spouse is injured or seriously ill; one parent is arrested or needs to relocate.
If the modification is justified, the ex-spouses should conclude a modification agreement consisting of all the agreed-upon changes. The modified divorce agreement should be put into effect by a new court order. It is highly recommended that the original agreement contain provisions of possibility to modify some issues.