RIS field for report numbers for exporting Elsevier Harvard

Hi, I'm wondering how to ensure a volume/report number appears when exporting Elsevier - Harvard style.
My RIS document has reports "TY - RPRT" and monographic serials "TY - SER". I've tried placing the volume in a number of fields and no matter what, when I export these using the Elsevier - Harvard style, the number never appears.
Any help would be appreciated! Thanks.
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