DME query with field that may contain &

Try 'escape' :

var s = portalWnd.DMEPath;
s += "?PROD=" + sPDL;
s += "&FILE=PATHFIND";
s += "&FIELD=EMPLOYEE;LAST-NAME;FIRST-NAME;MIDDLE-INIT
s += "&INDEX=PTFSET5";
s += "&KEY=" + vCompany + "=18=" + escape(vCode);
s += "&MAX=9999";
s += "&OUT=XML";

I am trying to retrieve 1 record. Here is part of my DME...
INDEX=APISET1&KEY=5=209186=WE 0092411&0100111=0=0&XCOLS=TRUE

The key to API is company (5), vendor (209186), invoice ( WE 0092411&0100111), suffix(0), and cancelSeq(0)
The & within one of the key values is causing it to fail.
I am not sure where I would put the escape(vCode)

are you hardcoding the invoice# ? if so, try

INDEX=APISET1&KEY=5=209186=escape("WE 0092411&0100111")=0=0&XCOLS=TRUE

if you are buliding the DME call with variables, then escape the variable that holds the invoice#: escape(vInvoice)

Or use escaped value for ampersand, i.e., & or %#37;

The escape function on the invoice variable did the trick
Thanks