Supporting data explaining issue Add feature id_mapping for destination plugin table. https://www.drupal.org/project/migrate_plus/issues/2949271

gistfile1.txt

id: assetnode2model
label: "Asset Nodes to asset model."
migration_group: d82tables
dependencies:
  enforced:
    module:
      - capacitype_move2aa
langcode: en
status: true
source:
  plugin: c5ontent_entity:node
  bundle: asset
  include_translations: false
  filter_published: true
process:
  # mapping handled at import function
  name: 'title/0/value'
  description: 'description/0/value'
  created_at:
    plugin: c5_timestamp_to_datetime
    source: 'created/0/value'
  updated_at:
    plugin: c5_timestamp_to_datetime
    source: 'changed/0/value'
  email: 'field_asset_email/0/value'
  phone: 'field_asset_phone/0/value'
  url: 'field_asset_website/0/uri'
  online_resource:
    -
      plugin: default_value
      default_value: []
    -
      plugin: c5_get_asset_online_resource
  status:
    plugin: default_value
    default_value: 1
  verified:
    plugin: c5_reverse_boolean
    source: 'unverified/0/value'
  contributors:
    plugin: c5_get_user_emails
    source: field_ref_user
  address:
    plugin: c5_address4aa
    source: field_asset_address
  geoloc:
    plugin: c5_geoloc4aa
    source: field_asset_geofield
  profile:
    -
      plugin: default_value
      default_value: []
    -
      plugin: callback
      callable: serialize
destination:
  plugin: c5table_asset
  table_name: assets
  database_key: aa
  id_fields:
    id:
      type: integer
  id_fields_map:
    nid: id
  fields:
    id: 'id'
    name: 'name'
    description: 'description'
    email: 'email'
    phone: 'phone'
    url: url
    online_resource: online_resource
    status: status
    verified: verified
    created_at: created_at
    updated_at: updated_at
    deleted_at: deleted_at
    profile: profile
    address: address
    geoloc: geoloc
    contacts: contacts
    contributors: contributors