新价值取代旧价值

Question

我有一个名为FormulaRevisionID（键字段和字符串）的选择器，当我 尝试输入新值旧值将被新值覆盖，而在数据库中也会存储新值

    here is my DAC field 

     #region FormulaRevisionID

            public abstract class formulaRevisionID : PX.Data.IBqlField
            {
            }
            protected string _FormulaRevisionID;

            [PXDBString(10, IsUnicode = true, InputMask = ">aaaaaaaaaa")]

            [PXUIField(DisplayName = "Formula Revision ID", Visibility = PXUIVisibility.SelectorVisible)]


        typeof(TSFormula.formulaRevisionID),ValidateValue =false)]

    [PXSelector(typeof(Search<TSFormula.formulaRevisionID,
                Where<TSFormula.formulaID, Equal<Current<TSFormula.formulaID>>>>),ValidateValue =false)]        

            public virtual string FormulaRevisionID
            {
                get
                {
                    return this._FormulaRevisionID;


                }
                set

                {
                    this._FormulaRevisionID = value;
                }

            }
            #endregion

在具有父关系的网格FromulaRevisionID字段中 FormulaRevisionID表单字段 当我添加新的字段时，网格数据基于表单字段FormulaRevisionID进行反映 任何人都可以建议我