EDIT

import eu.etaxonomy.cdm.model.name.TaxonName;

import eu.etaxonomy.cdm.model.reference.Reference;

                typeDesignationManager = new TypeDesignationSetManager(reg.getTypeDesignations());

    /**

     * To create an initially empty DTO for which only the <code>typifiedName</code> and the <code>publication</code> are defined.

     * All TypeDesignations added to the <code>Registration</code> need to refer to the same <code>typifiedName</code> and must be

     * published in the same <code>publication</code>.

     *

     * @param reg

     * @param typifiedName

     */

    public RegistrationDTO(Registration reg, TaxonName typifiedName, Reference publication) {

        this.reg = reg;

        citation = publication;

        // create a TypeDesignationSetManager with only a reference to the typifiedName for validation

        typeDesignationManager = new TypeDesignationSetManager(typifiedName);

    }