code: @Override
  	public CPAttachmentFileEntry fetchCPAttachmentFileEntryByReferenceCode(
  		long companyId, String externalReferenceCode) {
  		return cpAttachmentFileEntryPersistence.fetchByC_ERC(companyId, null);
  	}
docs: Returns the cp attachment file entry with the matching external reference code and company.
  
  @param companyId the primary key of the company
  @param externalReferenceCode the cp attachment file entry's external reference code
  @return the matching cp attachment file entry, or <code>null</code> if a matching cp attachment file entry could not be found