list must be used within a SAIL component

Could it be that there are multiple lineItems with all names empty? Putting multiple values in an if() condition results in a list of results. Did you try to use null instead of an empty string for the if-true value?

Thanks Stefan, I tried with null as well. It raised the same issue. I think if one of the item from the list is null it raises that error. 

Data with something like below gives the error

For the 2nd record and 2nd invoice has no line items in this case. If I remove the 2nd invoice or add a line item to 2nd invoice it works.

Regards,

SG

This isn't necessarily a fix but I think it could possibly help to handle the list text a little more explicitly - i.e. inside the numbered list component, iterate over the items and display them one by one.  Also, there should be no need for the if() statement doing null-checking; the rich text display field and its in-built showWhen parameter(s) should handle this.  Can you try this alternative?

a!gridColumn(
  label: "Tracker Entry Date",
  value: a!richTextDisplayField(
    value: a!richTextItem(
      text: {
        a!richTextNumberedList(
          showWhen: a!isNotNullOrEmpty(fv!row[P2P.invoice.lineItem.name]),
          items: a!forEach(
            fv!row[P2P.invoice.lineItem.name],
            a!richTextListItem(
              text: if(a!isNullOrEmpty(fv!item), "[blank]", fv!item)
            )
          )
        ),
        a!richTextItem(
          showWhen: a!isNullOrEmpty(fv!row[P2P.invoice.lineItem.name]),
          text: "(none)",
          color: "SECONDARY",
          style: "EMPHASIS"
        )
      }
    )
  )
),

This isn't necessarily a fix but I think it could possibly help to handle the list text a little more explicitly - i.e. inside the numbered list component, iterate over the items and display them one by one.  Also, there should be no need for the if() statement doing null-checking; the rich text display field and its in-built showWhen parameter(s) should handle this.  Can you try this alternative?

a!gridColumn(
  label: "Tracker Entry Date",
  value: a!richTextDisplayField(
    value: a!richTextItem(
      text: {
        a!richTextNumberedList(
          showWhen: a!isNotNullOrEmpty(fv!row[P2P.invoice.lineItem.name]),
          items: a!forEach(
            fv!row[P2P.invoice.lineItem.name],
            a!richTextListItem(
              text: if(a!isNullOrEmpty(fv!item), "[blank]", fv!item)
            )
          )
        ),
        a!richTextItem(
          showWhen: a!isNullOrEmpty(fv!row[P2P.invoice.lineItem.name]),
          text: "(none)",
          color: "SECONDARY",
          style: "EMPHASIS"
        )
      }
    )
  )
),

Thanks Mike,

I have tried this . This has worked perfectly fine. I wanted to avoid the for each. There many such columns in the grid and also each columns may have 1 to 10 line Items. So iterating over the items may cause performance. Currently we are using some thing similar iterating over each invoice  and display line items which we are experiencing high time in a!gridField evaluation. 

I will try this with large data set.

surjitg said:

So iterating over the items may cause performance

It won't.  This a!forEach() is only iterating over the individual items in that particular row.  It should have no significantly higher impact on performance than it already will be to show the row's items in a bulleted list.