Storm\Core\Mapping\EntityRelationalMap::AddIdentityPrimaryKeyMapping PHP Method

    private function AddIdentityPrimaryKeyMapping(IDataPropertyColumnMapping $PropertyMapping)
    {
        //Infer primary key table
        $AllColumns = array_merge($PropertyMapping->GetPersistColumns(), $PropertyMapping->GetReviveColumns());
        if ($this->PrimaryKeyTable === null) {
            $this->PrimaryKeyTable = reset($AllColumns)->GetTable();
        }
        foreach ($AllColumns as $Column) {
            if (!$Column->GetTable()->Is($this->PrimaryKeyTable)) {
                throw new MappingException('Identity properties of %s cannot map across multiple tables: %s.%s does not belong to %s', $this->EntityType, $Column->GetTable()->GetName(), $Column->GetName(), $this->PrimaryKeyTable->GetName());
            }
        }
        $this->IdentityPropertyPrimaryKeyMappings[] = $PropertyMapping;
    }