在保存一对一关系子对象时，会发生非法的关联

Question

我有两个域类如下：

    Class Parent{
         static hasOne = [child: Child]
         static mapping= {
                id(name: 'number', generator: 'assigned')
         columns {
               number(column: 'ST_NO') 
            }
         }
     }


    Class Child{
         Parent parent 
         static belongsTo = [parent:Parent]
         static mapping = {
          id(column: 'ST_NO',generator:'foreign', params: [ property: 'parent'])
       columns {
        parent(column: 'ST_NO', insertable: false, updateable: false)
              }
       }

更新子表工作正常。但是，当我尝试保存到子表时，它一直在向我抛出以下错误

     IllegalArgumentException occurred while calling setter for property [Child.id (expected type = java.lang.Long)]; target = [Child : (unsaved)], property value = [1234] setter of Child.id

转储父对象时。我收到以下验证错误：

      Field error in object 'Parent' on field 'child': rejected value [null]. 

任何人都可以建议我在这里做错了吗？