function lookUpCreditMemo(invoiceID) {
    var creditmemoID = "";
    try {
      var srch = search.create({
        type: "creditmemo",
        filters: [
          ["createdfrom", "is", invoiceID],
          "AND",
          ["amountremaining", "greaterthan", 0],
          "AND",
          ["applied", "is", 0],
          "AND",
          ["custbody_edc_trans_type", "anyof", [2, 4]],
        ],
        columns: ["tranid"],
      });
      var searchResultCount = srch.runPaged().count;
      log.audit("search count", searchResultCount);
      if (searchResultCount > 0) {
        creditmemoID = srch.run().getRange(0, 1)[0].id;
      }
    } catch (e) {
      log.error({ title: "LookUp Credit Memo: " + invoiceID, details: e });
    }
    return creditmemoID;
  }

I have this search, which runs fine if I removed the filter on the

applied

field, but with it, it gives this error:

An nlobjSearchFilter contains invalid search criteria: applied.

I can't figure out what is wrong with it

are you sure that

applied

is a filter?

What do you mean? Any field can be a filter, right?

no

What about custom fields?

The usual advice applies, make the search in the ui first then convert it to script

hmm, got it, thanks 🙏