In CIViC AID data examples like this one, classifications are represented as below:

classification:                 
  primaryCode: Tier I
  extensions:
    - name: civic_code
      value: TIER_I_LEVEL_A

Recall that a Statement classification must reiterate what is reported in SPO and strength and/or direction attributes in the data - i.e. it cannot add info beyond what is captured in these base attributes (see here).

In the CIViC data, AID records, the classification indicates a strength for the Statement, but the Statement objects have no strength attribute - which breaks this rule. Recall that we were very careful to stick to this rule in modeling and creating data for Variant Pathogenicity Statements.