only one measure

Hi All,

i'm goin crazy every day another problem.

In my datsource is only one measure

my code

var v_Z4S2 = DS_Z4.getDataAsStringExt( "00O2TL0YRWX9Y01TNNP985PF9",{} );

DATE_Z4S2.setText(X_DATUM_A);

if (v_Z4S2 == "")

{

    ZAHL_Z4S2.setText("0");

}

else

{

    ZAHL_Z4S2.setText(v_Z4S2);

}

i try getDataAsStringExt and getDataAsString but when the application started there is a message "error in code" but in deployment is no error

Is this getDataAsStringExt wrong?  No Filter is {}?

thx

br harry