Updating Multivalue Fields From Access

Hi,

I have an instance of SharePoint 2013 that, when connected to MS Access, displays as a table with a multivalue column.  I'm trying to update this value via MS Access, using syntax similar to the following:

update [Table Name] set [Column Name].value = 7 where [Column Name] = xxxx

No error is being thrown but when I examine the both the MS Access table and the data in SharePoint after I run the update, the data is not there.  I'm not sure if this is the correct forum for this but I thought I would start here.  

Thoughts?

Thanks,

Brian