Rule used in Paging Grid Component in the form:
=rule!TAX_CM_getDocDetailsForGrid(pv!taxItemID,data!pagingInfo)
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TAX_CM_getDocDetailsForGrid--Code:
=todatasubset(
  fn!apply(
    rule!TAX_CM_formatDocDetailsForGrid,/*Expression rule to form the link in grid*/
    rule!TAX_CM_getDocumentDetailsByTaxItemID(ri!taxItemID)/*Query rule to get the document details)*/
  ),
  ri!pagingInfo
)
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TAX_CM_formatDocDetailsForGrid--Code:

=if(ri!DocDetail.uploadStatus=cons!TAX_CM_DOC_STATUS_PENDING,setproperty(ri!DocDetail,"fileName",linktodocument(rule!TAX_CM_getDocDetailsByDocID(ri!DocDetail.taxDocID).appianDocID,ri!DocDetail.fileName,true())),setproperty(ri!DocDetail,"fileName",rule!TAX_CM_spCreateDocLink(ri!DocDetail.dcnIDTxt,ri!DocDetail.fileName)))