第三方系统调用WEBAPI新增物料时提示500

【背景】第三方系统调用WEBAPI新增物料时报错，用JSON报文在线测试时是正常的，报错如下，

"Result":{"ResponseStatus":{"ErrorCode":500,"IsSuccess":false,"Errors":[{"FieldName":"未将对象引用设置到对象的实例。","Message":"\r\nServer stack trace: \r\n 在 Kingdee.K3.BD.App.Common.ServicePlugIn.Material.Validator.BatchManageValidator.Validate(ExtendedDataEntity[] dataEntities, ValidateContext validateContext, Context ctx)\r\n 在 Kingdee.BOS.App.Core.Validation.ValidationService.Validate(IEnumerable`1 dataEntities, ValidateContext validateContext, AbstractValidator[] validators)\r\n 在 Kingdee.BOS.App.Core.Validation.ValidationService.TryValidate(IEnumerable`1 dataEntities, ValidateContext validateContext, List`1& errorInfo)\r\n 在 Kingdee.BOS.App.Core.AbstractOprerationService.TryValidate()\r\n 在 Kingdee.BOS.App.Core.AbstractOprerationService.Validate()\r\n 在 Kingdee.BOS.App.Core.AbstractSave.Validate()\r\n 在 Kingdee.BOS.App.Core.AbstractOprerationService.DoExcete()\r\n 在 Kingdee.BOS.App.Core.AbstractOprerationService.Excute(DynamicObject[] dataEntities)\r\n 在 Kingdee.BOS.App.Core.SaveService.Save(Context ctx, BusinessInfo info, DynamicObject[] dataEntities, OperateOption option, S