Rule2 ## WORKING FINE FROM HERE ##
----
Input: 

invoiceCodeDetails A cdt - has a field amountInGst - Number Decimal

Code
----
=load(
  local!itemsToken,
a!sectionLayout(
  firstColumnContents: {
    a!gridLayout(
      totalCount: count(
        ri!invoiceCodeDetails
      ),
      headerCells: {
        a!gridLayoutHeaderCell(
          label: "Amount"
        ),
        a!gridLayoutHeaderCell(
          label: ""
        )
      },
      columnConfigs: {
        a!gridLayoutColumnConfig(
          width: "DISTRIBUTE"
        ),
        a!gridLayoutColumnConfig(
          width: "ICON"
        )
      },
      rows: a!applyComponents(
        function: rule!FIN_INV_Sample1(
          items: ri!invoiceCodeDetails,
          index: _,
          itemsToken: local!itemsToken
        ),
        array: if(
          or(
            isnull(
              ri!invoiceCodeDetails
            ),
            count(
              ri!invoiceCodeDetails
            ) < 1
          ),
          {},
          1 + enumerate(
            count(
              ri!invoiceCodeDetails
            )
          )
        ),
        arrayVariable: ri!invoiceCodeDetails
      ),
      addRowlink: a!dynamicLink(
        label: "Add Coding Information",
        value: 'type!{urn:com:appian:types:FIN_INV}FIN_INV_invoiceCodeDetails'(),
        saveInto: {
          a!save(
            ri!invoiceCodeDetails,
            append(
              ri!invoiceCodeDetails,
              save!value
            )
          ),
          a!save(local!itemsToken, append(local!itemsToken, save!value))
        }
      )
    )
  }
)
)