Error in Vendor Open Transaction Editing

when am trying to open my vendor open transaction 

In Account payable --> Vendor Details -->Functions-->Open trans editing

am getting the following error

Cannot create a record in Balance (CustVendTmpOpenTransBalances). Currency: , 0,00.The record already exists.

solution : i changed the piece of code in the following path

• classes\CustVendOpenTransBalancesManager\add
  
  after declaration add this
  
  
   if (tmpBalances.TransOpenRecId)
  
      {
  
         //standard code
          tmpBalances.insert();
       }
  
  Source :https://community.dynamics.com/ax/f/33/p/66455/123372.aspx
  
  Please suggest for any other solution.