Model.call_BAPI_MATERIAL_GETLIST()
….
// import tables
var table;
table = bapi.addTable(“MATNRSELECTION”);
if(utils.isArray(importParams.MATNRSELECTION)){
var tableData = importParams.MATNRSELECTION;
for (var i = 0; i < tableData.length; i++){
table.addRow({
“MATNR_HIGH” : tableData[i].MATNR_HIGH,
“MATNR_LOW” : tableData[i].MATNR_LOW,
// 2 more fields are added >>>>>>>>>>>>>>
“SIGN” : tableData[i].SIGN,
“OPTION” : tableData[i].OPTION
// <<<<<<<<<<<<< 2 more fields are added
});
}
}
…..

!!!!!!!!!!!! Very important:
tools tends to overwrite bapi functions, while saving. So, todisable such as behaviour do the folowing:

in the function BAPI_MATERIAL_GETLIST change @overwrite-allowed parameter to false (see below)

/**
* Calls bapi BAPI_MATERIAL_GETLIST function
* @param {hash} importParams object with all import parameters passed to function
* @param {function} callback callback function to call if recieved data
* @param {function} failCallback callback function to call in case if error happend
* @return None
* ——————————————
* @generated-by SAPTools
* @overwrite-allowed false
* @generated-timestamp 1196248220429
* @bapi-name BAPI_MATERIAL_GETLIST
*/

And now we are ready to test our changes:
function testBAPI_MATERIAL_GETLIST(){
Model.call_BAPI_MATERIAL_GETLIST(
{“MATNRSELECTION”: [
//first row
{“SIGN”: “I”,
“OPTION”: “CP”,
“MATNR_LOW”: “*”
}
//second row
//,
//{“SIGN”: “??”,
// “OPTION”: “CD??”,
// “MATNR_LOW”: “*”
//}
],
“MAXROWS”: “50”
}, function(data){showTestData(data);}, function(err){ alert(“failure ” + err)});
}

showTestData = function(data){
alert(“MATNRLIST.item total: ” + data.MATNRLIST.length);
for(var i = 0; i< data.MATNRLIST.length; i++){
alert(data.MATNRLIST[i].MATERIAL);
}
}

The code aboves returns 50 items to me.