No result when searching for Material with Part Number.

met with a problem when I want to search for Material with Part Number.

Using the following code, no results are returned. The parameter "1788260211" is exist as it is from SAPGui.

....

JCO.Client client =null;

try{

IFunctionTemplate ftemplate=repository.getFunctionTemplate("BAPI_MATERIAL_GETLIST");

if(ftemplate!=null)

{

JCO.Function function=ftemplate.getFunction();

client=JCO.getClient(SID);

JCO.ParameterList input=function.getImportParameterList();

input.setValue(100,"MAXROWS");

JCO.Table partners = function.getTableParameterList().getTable("MANUFACTURERPARTNUMB");

partners.appendRow();

partners.setValue("1188220011","MANU_MAT");

partners.setValue("","MFR_NO");

client.execute(function);

function.writeXML("materialList.xml");

}

....

But when I set the both parameter empty

partners.setValue("","MANU_MAT");

partners.setValue("","MFR_NO");

there are some results.

anybody can tell me whether I use the BAPI,Table or parameter properly?

Thanks alot!