Editable grid using record type

Add the brackets () after the record reference in your value parameter.

value: recordType!KNS Product Details()

Thank you Harshit bumb, I have corrected the mistake but again getting error while saving the values from the New Row

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"
  )
}
)

Do you try to use dot-notation somewhere?

https://docs.appian.com/suite/help/23.4/reference-records.html

The problem is on line 27

no ,i have indexed all record fields properly

no ,i have indexed all record fields properly

On line 27, you haven't added any sort of field after the record reference