The 'Related' pattern is used to relate an evidence record to a non-evidence record. This is typically achieved by storing the unique identifier of the non-evidence record as a foreign key on the evidence entity. An example of this might be to relate a Paid / Self Employment evidence record to a core Employment record. This is done by storing the unique identifier of the core Employment record on the Paid / Self employment entity.
A feature of the Related pattern is that it is necessary to specify a list of case participant roles in order to be able to list the related records that may be chosen.