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```for (var i = 0; i &lt; fulfillTransform.getLineCount({ sublistId: 'item' }); i++) {
  var lineItem = fulfillTransform.getSublistValue({
    sublistId: 'item',
    fieldId: 'item',
    line: i
  });
  var lineBillingType = fulfillTransform.getSublistText({
    sublistId: 'item',
    fieldId: 'custcol_billing_type',
    line: i
  });
  if (soArray[a].items.indexOf(lineItem) === -1 || lineBillingType !== "One Time") {
    fulfillTransform.removeLine({
      sublistId: 'item',
      line: i
    });
  }
}```


Is it because the Sublist becomes smaller than your original Sublist line count and your loop i exceeds the available Sublist lines. 

you need to loop backwards in other words :wink: