editable grid-using record Type-Add Row

Im trying to add a new row to the editable grid using record Type data, getting error while saving the row . Anybody help me to Add new row and data entered by user to new row would be synced to record and DB.

a!localVariables(
  local!data:rule!IT_getProductDetailsFromRecord(),
  
  {
  a!cardLayout(
    contents: {
      a!gridLayout(
        label: "Product Details",
        labelPosition: "ABOVE",
        headerCells: {
          a!gridLayoutHeaderCell(label: "Product Id"),
          a!gridLayoutHeaderCell(label: "Name"),
          a!gridLayoutHeaderCell(label: "Category"),
          a!gridLayoutHeaderCell(label: "Price"),
          a!gridLayoutHeaderCell(label: "Brand"),
          a!gridLayoutHeaderCell(label: "Rating")
          
        },
        columnConfigs: {},
        rows: {
          a!forEach(
            items: local!data,
            expression: a!gridRowLayout(
              contents: {
                a!integerField(
                  value: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{153b4a0d-fa28-42b1-93a8-743296065f94}productid'],
                  saveInto: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details']
                ),
                a!textField(
                  value:fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{7d9347e6-175d-4ce7-8518-ac7d3a3188e5}name'],
                  saveInto: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{7d9347e6-175d-4ce7-8518-ac7d3a3188e5}name']
                ),
                a!textField(
                  value: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{0bd23d9d-6272-4401-ad24-11178974ad9d}category'],
                  saveInto: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{0bd23d9d-6272-4401-ad24-11178974ad9d}category']
                ),
                a!integerField(
                  value: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{479ce285-bbc8-4712-90b5-c171f482c82f}price'],
                  saveInto: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{479ce285-bbc8-4712-90b5-c171f482c82f}price']
                ),
                a!textField(
                  value: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{d7bfc7af-8dc8-4918-8bed-72ca1c5ab151}brand'],
                  saveInto: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{d7bfc7af-8dc8-4918-8bed-72ca1c5ab151}brand']
                ),
                a!floatingPointField(
                  value: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{dd8acd71-e555-4d3d-81d2-dc28c41273ef}rating']
                  ,
                  saveInto: fv!item['recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details.fields.{dd8acd71-e555-4d3d-81d2-dc28c41273ef}rating']
                )
              }
            )
          )
          
        },
        addRowLink: a!dynamicLink(
          label: "Add New Record",
          value: 'recordType!{271af57d-1ea1-4b98-bd80-8092624e72b6}KNS Product Details',
          saveInto: {
            a!save(local!data,append(local!data,save!value))
          }
        ),
        selectionSaveInto: {},
        validations: {},
        shadeAlternateRows: true
      ),
    },
    
    height: "AUTO",
    style: "TRANSPARENT",
    marginBelow: "STANDARD"
  )
}
)