Do you have any Idea of this Button functionality ?

Hi All

Do you have any idea of below functionality could you please suggest me on this. I hope your support & Presence 

Thanks in Advance.

Here is my Revision button code

 public PXAction<SSPAgreement> Revision;
        [PXButton(CommitChanges = true), PXUIField(DisplayName = "Revision", MapEnableRights = PXCacheRights.Select, MapViewRights = PXCacheRights.Select)]
        public void revision()
        {
            // Acuminator disable once PX1050 HardcodedStringInLocalizationMethod [Justification]
            WebDialogResult result = Agreements.Ask(ActionsMessages.Warning, PXMessages.LocalizeFormatNoPrefix("Are you sure you want to create a new revision?"), MessageButtons.OKCancel, MessageIcon.Information, true);

            if (result == WebDialogResult.OK)
            {
                if (Agreements.Current != null)
                {
                    SSPAgreement agreementsOldRecord = Agreements.Current;
                    SSPAgreement agreementsNewRecord = new SSPAgreement();
                    agreementsNewRecord.TemplateCode = agreementsOldRecord.TemplateCode;
                    agreementsNewRecord.Revision = (int)(agreementsOldRecord.Revision + 1);
                    agreementsNewRecord.AgreeNbr = (string)(agreementsOldRecord.AgreeNbr);
                    agreementsNewRecord.Active = agreementsOldRecord.Active;
                    Agreements.Cache.Update(agreementsNewRecord);
                    this.Actions.PressSave();
                    throw new PXRedirectRequiredException(PXGraph.CreateInstance<SSPAgreementMaint>(agreementsNewRecord.TemplateCode), "Agreements") { Mode = PXBaseRedirectException.WindowMode.Same };
                }
            }
        }

        protected void SSPAgreement_RowSelected(PXCache cache, PXRowSelectedEventArgs e)
        {
            var row = (SSPAgreement)e.Row;
            if (row.Active.GetValueOrDefault())
                this.Revision.SetEnabled(true);
            else
                this.Revision.SetEnabled(false);

        }