The Domain's translate method gives template outputs to the composeOutput method to get Translation outputs. In turn, the composeOutput method gives applicable template outputs to the makeCitation method, to get a citation to be included in the Translation output (follow T302431 for potential changes to the output interfaces).

Because the itemType and title fields are required Citoid fields, the makeCitation method refuses to create a citation if corresponding fields are missing in the template output provided.

On the other hand, the Domain's translate method also supports manually changing the mandatory (= force-required) fields.

As a result, if (1) mandatory fields are manually set, and itemType or title are not included, (2) a template is added without itemType or title fields, and (3) this template is applicable for a given target, then makeCitation will be called, but it will fail.

Consider either having the makeCitation method proceed anyway, even without itemType or title fields. This may change if we switch to a "use-Citoid-except-for"-approach where Citoid response would be used to fill in missing gaps, as described in T302019.