Element must be detached

Question

I am reading a Google Sheet files and merge to a Google Document.

The template has a tables and the first line for replace text has a table. The next line does not have a table structure and I would like to append the table until no more records.

Description

1. referral-doctor-data-new the data source to merge (monthly-q) worksheet is defined to copy fields to the google documents
2. accounting-monthly-statement-template Use as template <<variable>>
3. monthly-statement The merged document

The overview is that the template defined fields to obtain from the referral-doctor-data-new google sheet. The monthly-q worksheet is the format of the final merged document. I would like to Get all the detail transactions displayed in the Google Doc group by the Referral Doctor. All the required calculations and queries are done

Problem:

• Can merge one data but not multiple rows of data
• I could not append the second row of the table in the google document ( I need help on this) see error element must be detached.....
• There is seems unlimited Runs of the merge process ( I will figure this out)

Sample Files Merge Files for Goolge Sheet to Goolge Doc

Please advise how to detach from the element.

These Lines has error

  // if second row of data
       body.appendTable(element).appendTableRow()
       .appendTableCell("EXAMDATE")
          .appendTableCell("VISITNO")
          .appendTableCell("PATNAME")
          .appendTableCell("PROC NAME")
          .appendTableCell("NET");

Complete Code

 ///end of mail merge
  function copy() {
    var docid=""  //merge template
var docfinalid="";//merge final doc
var sheetid="";   //raw sheet
var ss=SpreadsheetApp.openById(sheetid).getSheetByName("monthly-q"); 
 //var data=ss.getRange("B11:T").getValues(); // from raw table
var data=ss.getRange("A3:G").getValues(); // from monthly-q table  
var refdoc=ss.getRange("J:J").getValues() ;//get ref doc list, unique
    for (var i=0;i<refdoc.length;i++ ){
       var formula="=QUERY(raw!B10:T,\"Select C,D,H,L,M,T where M='"+refdoc[i]+"'\")";
       var qformula=ss.getRange("A2").setFormula(formula);
       data.length=0;
       data=ss.getRange("A3:G").getValues();

      
         data.forEach(function(r){
            var inv=ss.getRange("B1").getValue();//self-define invoice code
       merge(inv,"31-01-2020",r[4],"TEMPADD",r[0],r[1],r[2],r[3],r[5],r[6]);
            inv=inv+1;
 
   });
         }

 
    
  }// end of copy function 
    
  function merge(inv,date,drname,add,examdate,visitno,patname,procname,net,total) {
      var docid=""  //merge template
var docfinalid="";//merge final doc
var sheetid="";   //raw sheet
var ss=SpreadsheetApp.openById(sheetid).getSheetByName("raw"); 
    var doc=DocumentApp.openById(docid);
  var sourceDoc = doc.getBody();

  var targetDoc = DocumentApp.openById(docfinalid);
  var totalElements = sourceDoc.getNumChildren();
    targetDoc.getBody().appendPageBreak();
   //get Yr from date
    //get Month from date
 
  for( var j = 0; j < totalElements; ++j ) {
    var body = targetDoc.getBody();
    var element = sourceDoc.getChild(j).copy();
    var type = element.getType();

    if( type == DocumentApp.ElementType.PARAGRAPH ){
      body.appendParagraph(element).replaceText("<<inv>>", inv)
                                      .replaceText("<<Date>>", date)
                                      .replaceText("<<Dr Name>>", drname)
                                      .replaceText("<<Address>>", add);

                           
    }
    else if( type == DocumentApp.ElementType.TABLE){
      body.appendTable(element).replaceText("<<Exam Date>>", examdate)
                                      .replaceText("<<Visit No>>", visitno)
                                      .replaceText("<<Patient Name>>", patname)
                                      .replaceText("<<Procedure Name>>", procname)
                                      .replaceText("<<Net Amount>>", net)
                                      .replaceText("<<Total>>", total);
      //second row of data
   
        var test=element.getParent();
 debugger;
      
     // if second row of data
       body.appendTable(element).appendTableRow()
       .appendTableCell("EXAMDATE")
          .appendTableCell("VISITNO")
          .appendTableCell("PATNAME")
          .appendTableCell("PROC NAME")
          .appendTableCell("NET");
        
    
     
    
      
      
      }else if( type == DocumentApp.ElementType.LIST_ITEM){
      body.appendListItem(element);
      }
//    ...add other conditions (headers, footers...
    inv++;
    }
  targetDoc.saveAndClose();
    
}
  

I have a list of data from GoogleSheet Merge to A Google Doc With reference to enter link description here I could not solve the problem