Audit columns are getting null value when I hits to save

Hi @ShahidaValiSyed04  Hope you are using same as the below DAC fields. Please verify 

#region CreatedByID

        [PXDBCreatedByID()]
        public virtual Guid? CreatedByID { get; set; }
        public abstract class createdByID : BqlGuid.Field<createdByID> { }

        #endregion

        #region CreatedByScreenID

        [PXDBCreatedByScreenID()]
        public virtual string CreatedByScreenID { get; set; }
        public abstract class createdByScreenID : BqlString.Field<createdByScreenID> { }

        #endregion

        #region CreatedDateTime

        [PXDBCreatedDateTime()]
        [PXUIField(DisplayName = "Created Date Time")]
        public virtual DateTime? CreatedDateTime { get; set; }
        public abstract class createdDateTime : BqlDateTime.Field<createdDateTime> { }

        #endregion

        #region LastModifiedByID

        [PXDBLastModifiedByID()]
        public virtual Guid? LastModifiedByID { get; set; }
        public abstract class lastModifiedByID : BqlGuid.Field<lastModifiedByID> { }

        #endregion

        #region LastModifiedByScreenID

        [PXDBLastModifiedByScreenID()]
        public virtual string LastModifiedByScreenID { get; set; }
        public abstract class lastModifiedByScreenID : BqlString.Field<lastModifiedByScreenID> { }

        #endregion

        #region LastModifiedDateTime

        [PXDBLastModifiedDateTime()]
        [PXUIField(DisplayName = "Last Modified Date Time")]
        public virtual DateTime? LastModifiedDateTime { get; set; }
        public abstract class lastModifiedDateTime : BqlDateTime.Field<lastModifiedDateTime> { }

        #endregion

        #region Tstamp

        [PXDBTimestamp()]
        [PXUIField(DisplayName = "Tstamp")]
        public virtual byte[] Tstamp { get; set; }
        public abstract class tstamp : BqlByteArray.Field<tstamp> { }

        #endregion

@ShahidaValiSyed04  Have you written any logic on the SAVE action and cleared any caches?

@ShahidaValiSyed04  Can you please share your code here, instead of screenshot.

@ShahidaValiSyed04  Can you check with the below code

public PXAction<SSPAgreement> Revision;
        [PXButton(CommitChanges = true), PXUIField(DisplayName = "Revision", MapEnableRights = PXCacheRights.Select, MapViewRights = PXCacheRights.Select)]
        public void revision()
        {
            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.Insert(agreementsNewRecord);
                    this.Actions.PressSave();
                    throw new PXRedirectRequiredException(PXGraph.CreateInstance<SSPAgreementMaint>(agreementsNewRecord.TemplateCode), "Agreements") { Mode = PXBaseRedirectException.WindowMode.Same };
                }
            }
        }

Hi @ShahidaValiSyed04  Can you please check that are you passing the all KEY fields to create a new record?