inbasket Display, data.js - 'undefined' is null

I have copied recsum.htm to make a new htm for display PO information.  We have a custom trigger for PO20 and needed a display for the inbasket. I have not been able to determine what is missing or wrong.  When I click on the inbasket item that uses my posum.htm I receive an 'undefined' is null or not an object, data.js, Line: 531 Code: 0  Char: 2 error.  Line 531 of the data.js file is referencing a data object in the DME call (lawson code).

My DME call:
var  logancall = new DMEObject(prodline, "POLINE")
      logancall.out = "JAVASCRIPT"
      logancall.field = "line-nbr;quantity;ent-buy-uom;item;description;vbuy-unit-cst;extended-amt;item-type;service-code"
      logancall.index = "pliset1"
      logancall.max = "25"
      logancall.xida = true
      logancall.key = m_Company + "=" + m_PoNumber + "=" + m_PoRelease + "=" + m_PoCode
      logancall.func = "displayPoSum()"
         DME(logancall, "POLINE")

Any help or suggestions would be appreciated.