... 69 of these maintain permanent resident diplomatic missions accredited to the Holy See ... The rest have ***missions with dual accreditation*** outside Italy, ...
en.wikipedia.org/wiki/Holy_see ic)

Name, diplomatic rank, functional title and date of appointment; ... Those who have d**ual accreditation** will retain their A-1 visa status. ...
missions.un.int/protocol/manual/3_6.html

**Dual accreditation** – having two or more responsibilities, such as an ambassador who is simultaneously accredited to two nations E Embassy – a diplomatic ...
www.washdiplomat.com/glossary.html

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Note added at 1 hr (2006-02-23 18:50:26 GMT)
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somth like:
:
..82 diplomatic representatives with dual accreditation..

or .. holding dual accreditation..

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Note added at 2 hrs (2006-02-23 20:04:00 GMT)
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and note that it is "accreditation TO (the host country)"