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I'm not able to modify taxonomy field values with REST API or JSOM for a specific library. My code works on other lists, but not on this particular library, what can the problem be?

  • The library has > 380 000 items.
  • Field can be changed via edit item dialog.
  • No error messages (REST API or JSOM).
  • Field is single value only, so no "_0"-problem.
    • Have verified there is no Single_0 (by title) field.
  • I want to use odata=verbose, but I have tried without it (and removed all the __metadata properties), with same result.
  • Updating other fields, such as Title, works (in same request, both JSOM and REST API).
  • I have used edit item dialog to change the value back and forth to verify that the term ID I'm trying to use is without doubt the correct one.
  • "Nulling" out the field does not work either (e.g., { Single: null }).
  • Have tried hard coding correct WssId and Label, but no luck.

My REST API-code looks like this:

fetch(`${_spPageContextInfo.webAbsoluteUrl}/_api/Web/Lists/GetByTitle('TaxonomyTest')/Items(1)`, {
  credentials: 'include',
  method: 'MERGE',
  headers: {
    'content-type': 'application/json;odata=verbose',
    'x-requestdigest': _spPageContextInfo.formDigestValue,
    'if-match': '*'
  },
  body: JSON.stringify({
    __metadata: {
      type: 'SP.Data.TaxonomyTestListItem'
    },
    Single: {
      __metadata: {
        type: 'SP.Taxonomy.TaxonomyFieldValue',
      },
      WssId: -1,
      TermGuid: '10114d7f-b240-4b93-a23b-15ce3e5b9bbe'
    }
  })
})

And my JSOM-code looks like this:

const ctx = SP.ClientContext.get_current()
const item = ctx.get_web().get_lists().getByTitle('TaxonomyTest').getItemById(1)
const value = new SP.Taxonomy.TaxonomyFieldValue()
value.set_termGuid('10114d7f-b240-4b93-a23b-15ce3e5b9bbe')
value.set_wssId(-1)
item.set_item('Single', value)
item.update()
ctx.executeQueryAsync()

I have not tried with CSOM.

Update

Was just able to update item using JSOM, but with a more correct approach:

const ctx = SP.ClientContext.get_current()
const list = ctx.get_web().get_lists().getByTitle('TaxonomyTest')
const item = list.getItemById(1)
const field = list.get_fields().getByTitle('Single');
const taxField = clientContext.castTo(field, SP.Taxonomy.TaxonomyField);
const value = new SP.Taxonomy.TaxonomyFieldValue()
value.set_termGuid('10114d7f-b240-4b93-a23b-15ce3e5b9bbe')
value.set_wssId(-1)
taxField.setFieldValueByValue(item, value);
item.update()
ctx.executeQueryAsync()

But still not with REST, but that might not be supported.
Note: My previous JSOM code does work on other lists, as well as the REST code. I can't mimic SetValueByValue in REST, since it does two method calls (when inspecting ProcessQuery, as well as the method is not exposed).

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