I am trying to search for a certain sales order number based off the tranid and return the internal ID of the salesorder. I cannot get my search to work and return the sales order internal id

var salesorder = '100004'
	var filter1 = new nlobjSearchFilter('salesorder', null , 'equalTo', salesorder);
	var column1 = new nlobjSearchColumn('tranid');
	var searchResult2 = nlapiSearchRecord('transaction', null , filter1 , column1);
	for ( var c = 0; searchResult2!=null && c < searchResult2.length; c++){
		var internalid = searchResult2.getId();
		nlapiLogExecution('DEBUG', 'number:',internalid);
	}

Can anyone tell me what I am doing wrong? Thanks!