Reject Function

I don't understand the purpose of removing holdCode from the cdt if it is null and only show the account id in that case.

But if I can understand the requirement correctly then you will be wanting to implement it as follows:

a!localVariables(
  local!map: {
    a!map(
      id: 1,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test", holdCode: "")
    ),
    a!map(
      id: 2,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test1", holdCode: "abcd")
    ),
    a!map(
      id: 3,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test2", holdCode: "")
    )
  },
  a!forEach(
    items: local!map,
    expression: if(
      isnull(
        index(fv!item, "account", "holdCode", null)
      ),
      updatedictionary(
        fv!item,
        { account: { id: fv!item.account.id } }
      ),
      fv!item
    )
  )
)

Thanks for the solution

But the purpose was not to remove the hold code ... The purpose was to just retain the map who actually has a hold code and ignore the ones that doesn't

Thanks for the solution

But the purpose was not to remove the hold code ... The purpose was to just retain the map who actually has a hold code and ignore the ones that doesn't

GautamShenoy said:

but then my requirement is that the ID should remain in the output

Then what about this that you have mentioned above in the description?

Sorry I framed the question wrong maybe ... I want the entire map to persist whose account have a hold code ... The other maps should be ignored .... Thanks for correcting and sorry for the error

Then, just make a slight change in the code.

a!localVariables(
  local!map: {
    a!map(
      id: 1,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test", holdCode: "")
    ),
    a!map(
      id: 2,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test1", holdCode: "abcd")
    ),
    a!map(
      id: 3,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test2", holdCode: "")
    )
  },
  reject(
    isnull(_),
    a!forEach(
      items: local!map,
      expression: if(
        isnull(
          index(fv!item, "account", "holdCode", null)
        ),
        null,
        fv!item
      )
    )
  )
)

edit: Even simpler 

a!localVariables(
  local!map: {
    a!map(
      id: 1,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test", holdCode: "")
    ),
    a!map(
      id: 2,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test1", holdCode: "abcd")
    ),
    a!map(
      id: 3,
      account: 'type!{urn:com:appian:types:PA}PA_accountTemp'(id: 1, name: "test2", holdCode: "")
    )
  },
  remove(
    local!map,
    wherecontains(null, local!map.account.holdCode)
  )
)

Thank you so much