if(
  rule!APN_isEmpty(
    ri!DocumentID
  ),
  {},
  load(
    local!taskInstanceDocuments: index(
      a!httpQuery(
        url: rule!RMM_getWebServiceEndPoint(cons!URL_POST_DOCUMENT_WEB_SERVICE)&ri!DocumentID ,
        method:"GET"
      
      ),
      "result",
      null
    ),
    local!body: if(
      rule!APN_isEmpty(
        local!taskInstanceDocuments
      ),
      {},
      index(
        local!taskInstanceDocuments,
        "body",
        null
      )
    ),
   local!result: if(
      rule!APN_isEmpty(
        local!body
      ),
      {},
      a!fromJson(
        local!body
      )
    ),
    if(rule!APN_isEmpty(local!result),local!result,local!result.documents)
  )
)

----------------------------------------
Try to embbed  DocumentDownalodURL in result and display that as downloadable link.
In that Way you dont have to pass document, and improve perfromance.